I got my Nexus One on Friday and I love it already! Not having a physical keyboard is always a bind, but it does make the phone much lighter and is is a better soft keyboard than WM6.5 offers.
I doubt it would happen but I think that the next phone really should have dual SIM support. I have a personal phone and a business phone, as do most senior management I know. Neither of them are on the same network and they are completely independent of each other.
I have seen various clone phones in China which support this feature but obviously the phone operators don't want them because they are a conflict of interest. For business users however this could be a winning feature.
Paris, because I bet she knows how to handle two at once....