According to several websites the elite subscription service will be free on the Wii u on black ops 2 meaning free dlc... more info is coming soon... activision did state they will do there best to bring the four content packs to the Wii u plus some possibly exclusive features and content... which is why they said earlier that not all content will be available on all platforms as it appears the Wii u is getting more... im on my phone and cp isn't working right but a quick google search will show the discussions are going on now.
Elite and DLC isn't the same thing, I think you're getting things mixed up here, and there is no exclusives at all for the Wii U.
Elite is the stat tracking service, which has always been free, don't why they are touting it that way now.
The DLC now comes in a form of Season Pass, which was called Premium Elite in the previous title, MW3. You can still buy those 4 map packs separately though
and Activision already said the Wii U will not be supported by Elite. Sure, they said they want to wager their options as to how they will bring that about later on after release. but the same thing was said about the PC version of Elite and nothing has ever come about that either, a year and a half later. I'm sure it is just a way of saying it will never be available, probably for a future title.
The DLC could still come, that shouldnt be too hard to bring out, but at this point, that isn't going to available either. Activision is woking with Nintendo to make DLC available. No exclusives though.
I'm still getting it for the 360 first, since all my friends will do that as well but all these minuses don't steer me away from the title on the Wii U. I've always hated split-screen, it is so intrusive for me that I don't enjoy it after a certain point. The Gamepad handling split screen more than makes up for everything else. The Vita will get a horrible COD title (Almost guaranteed) and I wanted to play a quality COD title on a portable device (at home) and the Wii U will also provide that. Hopefully more Developers implement similar ideas of splitscreen into their games.