dahuman on 14 February 2013
The interesting part is this:
"The difference with Wii U was that when we first started out, getting the graphics and GPU to run at an acceptable frame-rate was a real struggle. The hardware was always there, it was always capable. Nintendo gave us a lot of support - support which helps people who are doing cross-platform development actually get the GPU running to the kind of rate we've got it at now. We benefited by not quite being there for launch - we got a lot of that support that wasn't there at day one... the tools, everything."
Seems like they have a more recent dev kit to work with and Nintendo was able to deliver the support required, it's all in the tools and coding.
Here is the DF gameplay video:
