I have had both. I want one device. The sure type thing works but I want to go back to a full keyboard. Should be a better phone with an incredible screen. The internet will be useable at high speeds. Sounds like some good functionality to me.
Similar form factor, faster processor, quicker web browsing, support for MP3 ringtones. That's about all I can distill from what has been posted online.
About all I can muster is an "oh, that will be nice". I'm not sure it's a must have unless the screen is brilliant and battery life the same or better.