As many of us I just upgraded both E7 and N8 to Anna.
Overall impression is good however I'm having some problems with broken view tabs in apps.
So far I could not reproduce the problem on N8 but it is very obvious on E7.
Most of my apps developed using Carbide.C++ UI designer are showing the problem. If your app shows two tabs at some point it is not possible to switch to the second tab using the touch screen you need to use the arrows from the keyboard instead. Simply tapping the tab makes it flash and gives the tactile feedback but you remain on the first tab. I can reproduce it using my Panic Observer app. An app like Y-Tasks is also having that same problem.
Also the EDWIN control is quite broken too but it was already broken in S^3 if not before. (or maybe it's the rich text editor or something like that). EDWIN input with both physical and virtual keyboard will lag terribly if you have a few tens of lines in your document. Quickoffice is showing this problem which is a bit sad for a text editor. An app like Lightnotepad also has that problem. However the built-in Notes application does not. I guess it is using another control.