....So you have a link for that then? Them saying they've got other firmware versions planned? Thought not. And are you actually expecting them to say "yeah, fuk the Wii U, it's not selling so we're ditching it"? Of COURSE they're going to say that support will continue, doesn't mean it actually is doing though!
(However, it's a bit early yet I'll agree: IF the NX comes out as early as the end of next year like has been rumoured I'd say there's another good 12 months for the Wii U, firmware versions and all)
Anyway, I've got my MK8 DLC 2 downloaded now - you can release your stuff whenever you're ready lads!
Seriously though, like has been said by others, take as long as you need! You can't rush art and all that...