From my experience browsing the Minecraft file structure, it seems modding of the Wii U edition is very possible. The easiest and most obvious form of modding is applying texture packs. That's the easiest thing ever: textures are at content/Common/res. It even supports TPs from the PC version (AFAIK)! It has three folders for the same thing, res/, res/1_2_2/ and res/TitleUpdate/res/, and I've not tested it so IDK, but res/TitleUpdate/res/ seems to be the correct one, since it has more files. Now, I've got something else: There's a MediaWiiU.arc file at content/Common/Media/, which is obviously a compressed file. By opening it in a text editor, you can already see a lot of stuff: First there's a bunch of references of other files, ones that aren't anywhere else in the game data, such as Graphics\CreateWorldIcon.png, Graphics\GameModeGraphics\AwardIcons_0012.png & etc. Then, lots of unreadable stuff. Near the end, there's text. A lot of text. In all languages. Includes menus, tutorials, in-game stuff and etc. Definitely all the game's text. But how do I extract .arc files? It'll surely open up a lot of possibilities! I tried WiiUExplorer, but it didn't work. It did open Super Mario Maker's .szs however, so that's something?