Honestly, I'm sure ports from current consoles will never be "built completely from the ground up". Back when the 360 first came out, many devs just didn't make great use of the System. Turok looks awesome to this day, but CoD Modern Warfare does not. The CoD series is not known for the best looking game. I'm sure with a bit of tweaking, devs of all sizes will be making grander use of the Wii U.
Besides, Black Ops 2 is trash compared to the other Call of Duty games thus far. Crap maps, bad spawn (even worse than previous ones), and MW3 netcode done even worse.