Nokia supports it till 2015 iirc.

Not sure about dalvik or nitdroid. I wish they did port android to it, just for the hell of it.

Its a semisuccessor. More of a spinoff, really, than a sequel.

Personally I had the SGS2, and sold it to get an N9. N9 is, for me, a better phone. Multitasks better, appswitches better, and has a better design.

Course, you COULD get the lumia 800 or wait for the SGS3/Lumia 900.

Wouldnt recommend nexus at least, since sgs2 has better HW (albeit lower resolution).