• Final Cut Pro X version 10.2 release notes
• Final Cut Pro 10.2 (app store link)
  
  
• Motion version 5.2 release notes
• Motion 5.2 (app store link)
  
  
• Compressor version 4.2 release notes
• Compressor 4.2 (app store link)

Apple also posted a press release on these updates.
  

About Pro Video Formats 2.0.1 (4.2 MB)
This update includes support for the following professional video codecs:

• Apple Intermediate Codec
• Apple ProRes
• AVC-Intra
• DVCPRO HD
• HDV
• XDCAM EX / HD / HD422
• MPEG IMX
• Uncompressed 4:2:2

This update also adds the following MXF support:

• Native import, edit, and share of MXF files with Final Cut Pro X & Motion
• MXF share presets for Compressor
• MXF OP1a export

Apple Pro Video Formats 2.0.1 Install Problems/Tip:
Several OS X users reported they either had problems installing this update (via Mac App store) or it repeatedly appeared in Software Update. (Apple also later published a support doc about it not appearing in the Mac App store updates (suggesting the D/L updater above), but then pulled it apparently as Doc link no longer worked.) A Yosemite forum thread on Pro Video Format 2.0.1 repeatedly appearing in Mac App Store updates included notes on the download updater and a tip on using Pacifist. And here's a later tip reportedly from Apple Support:

* Move All Files from /Library/Quicktime/ to a temporary folder on Desktop
* Open App Store and download (install) Pro Video Formats 2.0.1 update
* Restart the Mac
* Now compare the contents of /Library/Quicktime folder with the temporary folder on the desktop. Copy any missing file(s) back to the /Library/Quicktime folder. (Do not overwrite any files in the /Library/Quicktime folder - copy only files in the temporary folder that are not in the /Library/Quicktime folder. You may want to repair permissions (using Disk Utility) after copying any files just to ensure they are set correctly.)
* Restart the Mac and check to verify update does not appear again

• About backups in iCloud and iTunes
• If you need help restoring from an iCloud backup
  
  
• If a droplet doesn't open in Compressor 4.2
• If photos or video files are missing or checkered in a Motion project
• If you can't burn a Blu-ray disc in Final Cut Pro X, Motion, or Compressor
  
  
• If clients can't connect using LDAP after upgrading your server to OS X v10.10.3
  
  
• How Power Nap works on your Mac (with list of macs that support it)
• If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on
  
  (articles from Saturday follow)
• If your computer unexpectedly restarts and then shuts down after installing the OS X v10.10.3 update (with tips including removing ManyCamVideoDeviceDriver.kext)
  
  
• If a flashing question mark appears after installing 'OS X Yosemite Recovery Update 1.0.' (if you have Filevault + Mac firmware password enabled. Includes steps to resolve.)

(Topic-based page of Tips, Troubleshooting & How-To articles for Mac/OS X/iOS Users.)
  

• Tips for SSL Certificate Problems after OS X Security Update 2015-004 (apple forum)
  (I didn't see this problem in 10.9.5, but some did based on several other threads.)
  
  
• Available disk space not reported correctly after Yosemite Recovery Update
  (one of several forum threads on this. One suggestion was force a Spotlight re-index but was not a fix. A different tip in another thread was turning Time Machine OFF and rebooting, but after turning TM on again the problem returned. If Time Machine OFF resulted in the correct capacity reported, perhaps it's a bug related to TM local snapshots.)
  
  
• Tip for OS X Server not updating to 4.1 (apple forums)

I don't use WhatsApp (or Yosemite), but posting in case it helps anyone else that is:

"nsurlsessiond" process in Mac OS Yosemite finally controlled
I do not know if someone has reported it before, but I finally found the reason of the "nsurlsessiond" process, that downloads (large) amount of data everyday, putting to its knee my Internet bandwidth for about an hour. I did search the Internet several times since upgraded to Mac OS Yosemite to know how to stop this strange behavior but other than a script to postpone the process until the next startup, I haven't found anything really useful. The situation seems to affect a fair amount of Yosemite users and it is known to be iCloud Drive related.

At least in my case it was related to the WhatsApp app backup routine that uses my iCloud Drive for storage. My iPhone's Whatsapp had more than a gigabyte of documents (years of messages with photos and video files from several chat groups) and it was setup for a daily backup routine. To alleviate the situation, users can setup less frequent routine (weekly, monthly), clearing the chat archives to keep the amount of documents small or shutting off the backup at all. The later can be done within the iOS application or within the iCloud Drive itself. Hope it helps users with the same annoying problem.
best regards, Juan"

• OWC Viper Pro Thunderbolt External SSD Premieres at NAB 2015 (sponsor blog)
• NVMe SSD: An Introduction to the Standards for PCIe SSDs (intel blog*)
• HGST ships NVM Express Compliant PCIe SSDs (press release)
• Apple in talks with musicians for exclusive streaming deals (reuters)
• Should Apple Launch an 8K iMac? (motley fool)

April 9th/10th, 2015 News Archive
• Nvidia Graphics Driver Update for OS X 10.10.3 (build 14D131)
• Nvidia CUDA 7.0.36 Update for OS X 10.10.x and 10.9.x
• iTunes 12.1.2 Released (info/download installer)
• 4 Reviews of the Early 2015 MacBook
• OWC Mercury SSD Firmware Updater 603ABBF0
• OS X Admin Framework security flaw only fixed in 10.10.3
• Tips for SSL Cert. Problems after Security Update 2015-004
• User Tip for Loss of Touch ID after iOS 8.3 Update
• iOS 8.3 - More free space? (discussion)
• Pacifist 3.5.3
• New/Updated Apple Support Articles: (partial list)
  - If a network user can't be created after you upgrade or migrate to OS X Server
  - How to use Pro Video Formats & MXF with Final Cut Pro X, Motion, Compressor
  - OS X versions (builds) for computers updated for Early 2015 Macs
  - Mac Basics: Ports and connectors on your Mac updated for USB-C
  - Using the USB-C port and adapters on your Early 2015 MacBook
  - How to identify MacBook models updated to add Early 2015
  - Using 4K displays and Ultra HD TVs with your Mac
  - Using multiple displays in OS X Mavericks
  - About Apple video adapters and cables
  - Get started with Photos for OS X
  - List of available trusted root certificates in OS X Yosemite
  - List of available trusted root certificates in iOS 8
  - Apple ProRes Authorized Products
  - Vintage and obsolete products listing
  - Setting up firmware password protection on PowerPC-based Macs (archived)

For links to older news pages, see the Archives.