yes about platforms, sorry that was kinda vague.. knowing how to reach those platforms can sometimes have subtle differences and sometimes not.. using XDK for android is not "hard" but it takes some software to install and understanding the process to a point of comfort is time well spent. Same with Ejecta / iOS if you're going for that. Ejecta makes it easy but knowing what things to change in Xcode takes a little time to get familiar with it. Tizen also has a few hoops to jump through. The web portals like Chrome store and Kongregate also have a few things going on with them, but they are generally pretty easy. Facebook has some gotcha's too, but once you get through those it too is easy. here is one of my games and a list of platforms I have reached or will be reaching soon http://part12studios.com/portfolio-items/bee-active/
None of them are really hard, its just finding the right (working) tutorials/advice that will get the jobs done. The other big time consumer is every app store just about, wants uniquely sized art for screenshots, icons and promo material.. so be ready to put some time into that. ideally work with 16:9 imagines for screenshots, but be ready to crop them / letterbox them down to other sizes like iPhone4s and older screens.. ipad.. and a lot of the promo icons are odd shapes as well.
Great to know about Wii-U approval time. I'm excited about the prospect, especially since I have just about finished a game adaptation for the Ouya, which means I could reach both consoles with the same game project (with some tweaks of course).
Also, I would suggest you give yourself some "primer" files that you can reuse for various platforms. you'll notice that of course once you make a 2nd game you have to make all the art for the next game, so what i've found helpful is to make a bunch of black images at each needed resolution to better prepare myself for the storm of promo materials. also be sure you get those darn C2 default graphics replaced early on.. because they will be exported all the time to each platform having to be replaced a bunch..