First thing they need to do to make this game a success is to use a new engine, not just small updates to the old engine. Lets face it destructible and interactive environments is a must have now, its expected by players and playing in Call of Duty's non interactive worlds makes it seem dull and boring. The Second thing is that the Exo Suits have to be truly unique and not just a rip off of Titanfalls system. So far we know that the Exo Suits can wall climb, jump large distances, punch through things, and let you drop kick, which could be awesome! If it actually turns out they play like they are portrayed.
Third thing is that the trailer shows vehicles such as hover tanks, hover bikes and spider mechs. Now if these are in multiplayer and not just campaign then this could change the way that Call of Duty plays forever and give some much needed innovation the the franchise. Fourth and one of the most important is that multiplayer needs to change, spawns need to be fixed for starters, but what I really want is innovations to gameplay! Exo suits is a good start if it can be capitalized on. One thing they could do is remove quick scoping, they could also give us interactive environments, vehicles, unique guns, well designed maps, more players, and creative game modes.
So there it is, those are the changes that I believe need to happen for Advanced Warfare to be a success, and one that new and old players can enjoy. Lets see some creativity and not just a bunch of copy and past for the money. So to all the gamers out there I say keep playing and keep having fun!