Dead Island sold enough copies to make it one of Techland’s prime properties and it looks like they might have a sequel in the works called Dead World.
On top of that, Techland may be creating a mobile "Dead" game called Dead Stop. Techland filed a trademark for Dead Stop in the US for video games and a second class specifically for "entertainment services and providing an online game via an application for mobile phones and other electronic apparatus"
The trademarks for Dead Island and Dead World don’t mention either of these features. Sounds like this could be a mobile zombie game.