I recently had the opportunity to go through a clean install of SW2011 and see what has changed as far as hotkeys go. You can go to http://www.kcswug.com/main/index.php?option=com_docman&task=cat_view&gid=40&Itemid=60 and grab the file.
Basically what I found was three new ones set out of the box.
Home - Scroll to the FM tree top
End - Scroll to the FM tree bottom
F8 - Hide/Show the Display Pane
I also found the new opportunity to set a hotkey for Exit Isolate. Since I have "I" set to Isolate, I set "Shift-I" to exit isolate.
Let me know if anyone finds some I missed and I will update the list.