If you are asking, then my answer would be "YES"
(at least to the slide out keyboard and a better screen part).
But again, its just me.

I would want the successor to have the best of both worlds though instead of being exclusive of each other. That way it makes it more versatile (but sadly more expensive too). Its now upto Nokia to decide the balance.

I would love to check under the hood of the Fremantle SDK, but again I am not that knowledgeable. That why I only stick to "I would like this, I would like that" kind of threads.