Board Thread:Plants vs. Zombies 2: It's About Time/@comment-25154254-20141107023109/@comment-4077536-20141108114222

Far Future is a standard world since it was supposed to be released very soon after the first release, but was delayed by the 1.7 update. The old map is even present in the Chinese version.

Dark Ages was also going to be standard, but that was the old Dark Ages, of which the new Dark Ages has only traces of.

Technically, Big Wave Beach is the first "fully" new world, and whatever comes next (an ice age themed world, it would seem).