Q12: I would like to know about the World names that will be ready at launch and also which of those Worlds will be prepared for legacy/new players.

A12: The Worlds used in version 1.0 (a.k.a Legacy Worlds) will remain as is. Also, those Worlds will have the "Legacy" tag at the end of the World name. As far as Worlds for new players, it will be announced via the Developers' Blog so please stay tuned!
This answer, I am sure, will put minds at ease. No more confusion! I agree with the decision to keep those past names the same.