They've already released so many creature-based games in the past, something like a Jurassic Park franchise would be revisiting old ground. It's the safest bet from the perspective of their prior experience, but I wonder if they will just end up eating into their own management sim market a bit.
Somethiing like Bourne or Bond makes sense. They have the engine technology, and it's a genre that they've obviously wanted to work on in the past. Human interaction hasn't been a strong suit of FDEV's games, but they did too much work on The Outsider to just let it rot.