I went silent because I realized in retrospect I announced it too early and I should have waited until more was done.
So here's your update!
We ultimately had to drop WiiU support because Nintendo killed that sucker fast.
PS4, PSVita, and XBox One are still go. Nintendo Switch is a possibility.
As for PS4, PSVita, and XBox One --- Defender's Quest will ship on all three of these platforms soon. Probably before the year is out. Specifically, the backend tech is done, the console-specific game UX code is done, and I am going through the certification checklist on all three platforms and we're most of the way there. I expect to enter certification itself imminently.
Once I have shipped my own games with this tech I will talk with my partners and put together a final plan for making it more broadly available. Things took longer than I expected and wound up being more complicated, such is gamedev.
(This is Lars, not Emily, I forgot I was on her account)