I have experienced a lot of little problems, especially with some of
the new graphics and also with library features.
While you are waiting you might want to spend time learning some of the
more common things you do that have been reworked:\
1. Different symbols for a lot of the mouse feedback.
2. Very different Select Other behavior.
3. Different exploded view behavior
4. Different trim command behavior.
Also, check this newsgroup for what has already been posted.
And just for the record. I am still using 2004 SP4.2