Or are they just selectively excluding it from discussion for the heck of it?
Nintendo has NDAs about pretty much everything to do with the system, at this point. It was mentioned just a couple of pages ago that Treyarch is showing BlOps2 Wii U to press, but it was nowhere on the annoucement trailer.
All that aside, I highly doubt Epic is too concerned with Wii U, at this point. First they have to get UE4 going to their targeted systems/specs.
Then, they may spend time trying to allow lesser systems, such as Wii U, to run under the same engine. That'll still be some time away. The hope for Wii U is that whatever base featureset UE4 will need will be present on Wii U. It's definitely not a targeted/intended system, but just like UE3 support widened, so will UE4 support. It's just a matter of if it'll widen to the Wii U, too.
Everything I've seen on Wii U looks like current gen stuff.
What ports have you seen on Wii U?
And ports like Darksiders and Rayman aren't running at 1080p 60fps.
The Darksiders team said that they had a definite goal to make all versions look the same. They're intentionally
not trying to make the Wii U version look better. Still, there's the question of where you saw a Wii U port running.