The ultra edition add:
-update the previous scenes
-add more animation (2000 apparently)
-the game come with a book of 160 pages
This is what I understand after translating a little bit of the getchu page.
Hope it help.
It's been discussed/brought up in the previous Sisters thread - HERE
You can be forgiven for missing it because the threads been buried a bit. But rimisicar pretty much mentioned the differences.
New Hscene and touch up of older scenes. Also its not 2000 scenes but their boasting over 2000+ combined frames for the animations. So thats a lot of work not just small gif loops =P
The 160 page artbook is apparently for preorders
thank you for information and sorry for creating existing thread.