I hope they don't add more megapixels or take away RAW. I have wanted one of these for a while, but haven't been able to justify it yet. Hopefully they don't take away what makes it good before I can get one.
Could you imagine an S90 w/ an aps-c sensor? Not quite an evil w/ changeable lenses, just an s90 w/ a larger sensor. That would be cool. Just to clarify, I haven't heard anything about that...this is just me dreaming here
My guess is they will add Megapixels - they have always done.
On the other hand - compare the 7D to a 400D - same sized sensor - the 7D has better high ISO - so given that the technology has been improved a small increase - maybe to 12-15max wouldn't necessarily be a bad thing.
RAW - if Canon thinks then they'll keep RAW - because that was pretty much THE selling point of the S90.