I like the british voice acting, but at least in the opening scene (with dunban, 1 year ago, etc), the lip sync seemed to be completely japanese with no adjustment for the english voice acting, this made me switch to Japanese.
A sequel on the Wii U would indeed be awesome, I'm about 12 hours in, and loving it a ton.
Everything feels great, no pointless backtracking, excellent music, combat is fun with no generic classes, huge open world to explore and a ton of collectibles, story that is genuinely interesting. Only thing thats frustrated me slightly was some monster drop quests (like killing 4 frogs, getting 4 of the 5 frog drop quest items you need, in a row, then having to kill 20 more frogs to get the 5th one, bad luck, but still), and sometimes I run up and down a location where a "boss" monster is supposed to be like 5 or 6 times before I find it, probably my fault, but with such huge environments its easy for things to hide.