Not really helpful.
Does anyone know the answer to the original question?
As far as I know there will be only 16 GB version, at least there were no even any rumors about other sizes. But only Samsung know the truth like S3 mini unexpectedly ...
Menu style can be changed under Settings - Personal - Menu style
Settings style will remain the same, you can not change it.
Private_Investor, no, it's not safe to say that :) Actually there is a soft reset (or reboot, as you like) combination.
I'm not sure, if it still still unknown to OP but this might help someone else. All you need to do is to press Power+VolDown+T...