Jonathan Blow, the creator of Braid, when discussing his new game, The Witness has said that:
...having more memory would make a huge difference to being able to bring a game like this to a console. It makes it much easier.
He also mentions he was told the Wii U "has a lot more RAM" than other consoles, although he didn't share any specifics beyond that. Unfortunately, it doesn't sound like the game will be coming to the platform since he says he is "unsure about [the Wii U] for other reasons, especially in light of the iPad."
That comment about the iPad might twist a few people's knickers, but it is a shame The Witness probably won't be coming to the Wii U. At least the technical specs are (sort of) being pieced together though.
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