I'll wait, as I've been pretty disappointed with open world gaming this gen. inFamous is pretty much the only new take I've enjoyed, and it was because of the superhero angle done right. GTA and RDR were horribly boring IMO.
Maybe this will shake it up, but one can only do so many car chase, clear the building, and package retrieval mission before getting bored. Rockstar lost something with some of it's more interesting missions in Vice City and Sand Andreas migrating to next gen, and no one else has picked up the torch. Open world you have this huge, living breathing playground.... get creative with it!