We already know Carmack's thoughts on the iPhone vs. Nintendo DS / PSP, as they've been echoed before once or twice, but here's one new to us: "You should be able to do something that's better on an iPad than anything that's done on the Wii," according to the John that spoke with Kotaku. That's all purely theoretical, as it's really up to the developer as to how much power it takes advantage of, and even with the tablet in question, "we're nowhere close to maxing out what could be done on an iPad." Oh, and Android? There's work being done for the Little Green Platform as well, but via TUAW John, "there's a lot of things with how the distribution platform works and the diversity of the platforms that you have to target, where things are still much, much nicer on the iOS world."
As for id's next foray in the "iOS world," Joystiq learned that a driving game based in the Rage universe is in the cards, and perhaps something inspired by Quake Arena: "maybe focusing on the lightning gun, and call it 'Lightning Arena' or something, that would be a full roam-around FPS game." When asked about his resemblance to one Kevin Bacon, all reports indicate Carmack vanished behind a green-tinted smoke cloud of 1s and 0s, leaving in his wake a three-foot tall statue of Commander Keen made from old shareware discs.
Apple iPad Air 2
Nintendo Wii console
Sony PlayStation Portable PSP-2000