The Plants vs. Zombies IP is a particularly interesting case. After creating one of the biggest casual hits of all time in 2009, Popcap kind of just sat on the property, keeping quiet about future plans despite its popularity. Well here we are in 2013, and there are at least two PvZ games on the way -- Adventures, and Plants vs. Zombies 2.
I must warn you, Adventures is a social game made exclusively for Facebook. No, this isn't the full sequel you've been wanting for years, but that doesn't mean it isn't worth your time.