PvZ was to me one of the best "exclusives"(despite the PC version) xbox one managed to secure and is a big loss for them to lose this exclusivity, in my opinion of course.
I think it looks like a good game.
The decision of putting this on PS4 is a good one, that will most likely help the PS4, EA and more importantly the IP.
But since i am not getting the PS4 for now, maybe i get this on steam/PC.