I think it is probably unfair to put Watch Dogs and GTA in the same category. They are both open world games but GTA is a sandbox game, whereas I don't think Watch Dogs will be. Either way, i'm hoping that Watch Dogs will be different to GTA, don't want a copy of GTA but more techy.
This game is only coming out on the next gen consoles sadly, same with Watch Dogs I think? But it looks interesting, and again an OPEN WORLD.
Biggest surprise for me was seeing Tom Clancy's name on it, in recent times the majority of stuff he puts his name onto has looked and resulted in being mediocre.