My concern with WW2 is that no matter how good the game is; Activision will ruin it. Modern Warfare Remastered was perfectly ideal for the first few weeks but when supply drops hit and players were running around with broken bottles as melee weapons along with pink guns, it just felt the ultimate hardon killer.
I'm not convinced by Sledgehammer either - they've been with the franchise for nearly 8 years now but they don't have anything decent to show for it and their relationship with the community isn't great either. They do sound like they are taking the campaign very seriously and are working very hard on providing an authentic and compassionate experience but in regards to the multiplayer portion; I really don't know what to expect. Their idea of making the game ultra compeititive with aggressive SBMM like they did with AW makes me uncomfortable and it dramatically impacts connection when skill is prioritised over providing the best possible level of matchmaking. This game needs proper dedicated servers and connection-led matchmaking. Sadly we'll end up with hybrid servers (mix of dedi's and P2P) as we have done for years now plus e-sport styled matchmaking.
We also know the guns will be 100% authentic but with supply drops; we'll probably see variants which will either be stat or both stat and camo based. The thought of seeing players running through trenches with lime green guns in WW2 makes me uncomfortable but I can't see how else Activision are going to make supply drops glamorous so they can turnover another $3bn from them.
In terms of the maps; I'd like to see real life locations mashed into appropriate 3 lane designs. The current Infinity Ward team cannot design maps for shit (Siege, Chasm, Stonehaven, Free Fall and every map in Infinite Warfare including Terminal which they murdered along with Rust) with their no flow and corner-laden right angle uninspired designs. Treyarch are very consistent with their maps but Sledgehammer were also decent if you take out a few which were primarily exo-suit focused. I think they may do a reasonable job with the maps in this game.
The thing that has killed COD in recent years aside from the games being plain trash is the underwhelming and largely forgettable killstreaks. I've played Ghosts, AW and BO3 along with IW and I'm struggling to name one aside from the usual UAV. I remember that fucking dog from Ghosts and a few other shitty ones from other games but you cannot beat the likes of the AC130 and Pred missle. Even the non-controllable ones such as Harrier and Pavelow all from MW2 were fun to call in and it was great to get kill after kill. I honestly could not name one or even remember some of the top-level ones in the last few games they are that boring.
That's just a few points off the top of my head but all in all; I don't think they'll ever be able to match the old days of COD4, WAW, MW2 and BO1. COD is nothing new now matter what they do. The concept is burned out in a very tired genre and franchise. People got sick of BF1 and MWR in no time not because they aren't good but they don't offer any longevity or appeal like the old COD games did back in the day and a lot of gamers who were once playing for 1000 hours a year have moved on to other things in gaming and life in general. I used to be able to have 3 hour sessions but I can barely play 3 matches of COD a day and that's been the case for years. There's always something better I can do with my time and I fear no matter how good WW2 is; it still wont impact me for the long term.