@CKurt: Actually, I think Silverlight for XBox is very plausible.  In fact, I blogged about that very subject last night (among other PDC predictions). 

And I think Silverlight 5 Beta is a very good possibility.

I don't think Silverlight for Android Phone will be announced as it will steal WP7's thunder quite a bit.  I don't see Silverlight appearing on any ARM processors outside of the Windows & Symbian brands for awhile.  An x86 Android tablet on the other hand...