Re: Garden Warfare 3 and what this game is meant to be.
The majority of people discussing the unannounced and unconfirmed GW3 are either making a huge assumption based on the "typical" every-two-years release schedule for most franchises, one vaguely worded job listing from before the PopCap layoffs or they are relying on posts written by other people making those assumptions.
In the post-layoff era I'm personally still hopeful that a GW3 will be realized since the studio is supposed to be focusing its efforts on "Key titles and new projects" so I would hope that Plants vs Zombies is one of those key titles and that Garden Warfare will remain in development along with PopCap's stable of surviving mobile games for possible future releases, but I'm not going to hold my breath expecting it to show up any time soon.