any devs know the answer to this?
The question is will it be too different.
of course not. No 2 halo games, save for possibly halo 2 and 3, have played the same.
According to those who have played, it feels mostly like its in-between halo 2/3 and reach. Halo 3 speed and jump height, fast kill times of halo 2/3, armor abilities like halo reach but more subtle like the equipment of halo 3. There’s also a lot of new stuff like customisable loadouts and a whole new faction’, worth of enemies and weapons.
in short, halo 4 will certainly feel like halo 4. No idea what that means compared to other games yet.