User blog comment:Zombieman1350/When Will It Come?/@comment-4077536-20140131202034

We don't know. Only a certain amount of people are getting the update (which is not complete - https://twitter.com/PlantsvsZombies/status/428690069138862080) like the last time.

My guess is about in 1 week or maybe 2, since that's how much it took for update 1.7.