I went to a preview last week too...interesting stuff.

Some other things I remember:
Query Rewrite - It will pick out the "worst" SQL, and then suggest how to fix it. If you accept, anytime that sql is run, Oracle will run it IT's way instead. So no more complaining about bad 3rd party SQL.

A note about the RMAN backups - A gothcha is that all of the backup information is stored on disk... not tape. The estimate I heard was that you will need 2-3x your DB size in extra storage for this feature. Same thing goes for Flashback Database if I remember correctly.

OEM - I've heard you still need the repository, just that there's no Management Server to mess with. Also, there WILL be 32-bit agents so you can monitor 8i and 7 databases with a 10G OEM. (For those of us who can't monitor our 32 bit unix DBs with 9i OEM).

That's all I can remember right now....

Jodie