Nah, from its changelog I have come to realize that this will be the same as 2.19! It is. Once I build it, I do quick test on MyPaint and GIMP. Here is some "highlights"
1.Native theme (wimp) still not working, though you could still use libwimp.dll from 2.16 if you want (will get screen corruption)
2. Peculiar interface behaviour still occured. For example, once you exploring sebmenu item (in menubar), the exposed submenu wont be disposed
3. Tablet with pressure-sensitive not working, crashed or act erratically but seems only affect drawing apps. Selection, blocking text and other non-drawing are normal.
4. Gdiplus still not working
Hopefully forthcoming GTK 3.0 won't be disappointing.