• NVIDIA announces TITAN Xp, Mac Pascal Drivers Coming (nvidia blog)
  (from the blog post)

  "Open to Mac Community
  Speaking of users, we're also making the new TITAN Xp open to the Mac community with new Pascal drivers, coming this month. For the first time, this gives Mac users access to the immense horsepower delivered by our award-winning Pascal-powered GPUs."

  Finally we will get Mac drivers for the GTX-1xxx series. (As of early April, the Nvidia web drivers have only supported 9xx and earlier cards.) I hope this means the next Mac Pro will also have a GTX-1080 (or better) card option. (And that Apple's promise of a "Modular" Mac Pro means they'll use standard form factor components. This makes it easier for Apple and owners to upgrade (and repair) them in the future.)
  
  
• Apple to Redesign Mac Pro, Comments GPU Cooling was a Roadblock (anandtech)
  
  
• Apple pushes the reset button on the Mac Pro (techcrunch)
  
  
• Apple adjusts Mac Pro pricing, but you still shouldn't buy it (verge)
  
  
• The Mac Pro Lives (daring fireball)
  
  
• After 10.12.4 update - (DIY) FusionDrive Mac won't boot (Apple forums)
  
  
• Apple To Develop Own GPU, Drop Imagination's GPUs From SoCs (anandtech)
  
  
• F1™ 2016 for Mac (OS X 10.12.4) released (see feral's system requirements)
  
  
• Apple Xcode v8.3.1 (macOS 10.12 or later)
  - Fixes an issue that could produce app archives that were larger than necessary
  - includes Swift 3.1 and SDKs for iOS 10.3, watchOS 3.2, tvOS 10.2, and macOS Sierra 10.12
  
  
• Little Snitch 3.7.4 (4728) for OS X 10.10 or later
  - Fixed a possible local exploit allowing privilege escalation in Little Snitch Installer
  - Improved handling of apps running in iOS Simulator.
  - Fixed a crash of Little Snitch Configuration when editing multiple temporary rules.
  - Improved VPN detection.
  
  
• iOS 10.3.1 release notes
  "includes bug fixes and improves the security of your iPhone or iPad."
  (See below for doc on WiFi related security fix)
  
  
• Yamaha MusicCast Controller (US) iOS app v2.21 (iOS 9 or later)
  - "Functionality improvement"
  
  
• Firefox web browser for iOS v7.0 (iOS 9 or later)
  - iPad users, all open browser tabs now appear above the address bar for quick access.
  (reader said beware - early user reviews not good.)

• Apple Web Server notifications
  
  
• About the security content of iOS 10.3.1 (WiFi related fix)
  
  
• About the security content of Apple Music 2.0 for Android
  
  
• How to Create a bootable installer for macOS
  
  
• (How to) Identify your iPhone model
  
  
• About the security content of Apple Remote Desktop 3.9 (new doc dated 4/1)

Page of How-To, Troubleshooting & Tips for Mac/OS X/iOS Users from Airplay to Thunderbolt.