Windows 8.1 Update 1 Leaked

The leak:

http://wzascok.livejournal.com/10860.html

Paul Thurrott and Mary Jo Foley articles:

http://winsupersite.com/windows-8/windows-81-update-1-very-early-preview

http://www.zdnet.com/microsoft-forges-ahead-toward-windows-8-1-update-1-7000024928/

Short version: There's nothing interesting in the build yet. It will be revelead at Build 2014.

Will it bring more API parity?

Will it be a Service Pack?

When will WinRT==WinPRT (or just WinPRT=WinRT)?

What will it mean for developers?

Will we see some WP8.1 improvements as Cortana or Notification Center?

Will first party apps be updated?