Board Thread:Plants vs. Zombies 2: It's About Time/@comment-5792287-20131203091220/@comment-4077536-20131207205617

Starfruity wrote: The "new plants, new zombies, and new worlds" screenshot just means that PvZ2 has new plants, new zombies, and new worlds as opposed to PvZ1, not that the update added new plants, new zombies, and new worlds.

Yes; since they announced the update they've advertised it like PvZ 2 v. 2.0, i.e. a remodeled version of the game with some changes (Gargantuars, Turbo button...).