When you say "I feel that this may be CoD doing what Halo 4 tried to do, except doing it right." I can only think you're saying that when Halo 4 implemented Jump pack things, Promethean Vision, Futuristic Hover Bike Thing, and Mechs, they did so unsuccessfully- To which, I'd have to disagree. Halo 4, for all it's shortcomings at launch, implemented some very innovative and unique features into the Halo franchise.
The Mantis is an incredibly powerful vehicle balanced by it's Spartan-like shields that can easily be taken down and it's relatively low health for a vehicle.
Promethean Vision was and still is criticized by many fans in the Halo community, and I can understand some of that criticism to an extent. It's an armor ability that's primary purpose is squashing campers out of the game. For those that don't camp, Promethean Vision is just a bit of an upgrade over your radar.
I'm going to assume you're referring to the ghost, well the ghost has been around since Halo CE and still functions pretty much the same way it did in the original game. I can't imagine how this was in any way unbalanced in Halo 4.
The Jet Pack has been around since Reach, and has a big difference on the way a game is played and the way an objective is handled. The Jet Pack was highly overpowered in Halo: Reach with a very large amount of possible usage before it drained out. I think if anything, 343i managed to refine the Jet Pack very well when they brought it over to Halo 4.
For all the similarities, they're still very different titles. I think Call of Duty will make good use of these features, and will once again top the charts in sales, but they won't be used in the same manner as was capable in Halo 4.
Halo =/= CoD