Verified answer

Yes - the game capture devices only care about technical specs of the signal, not which platform it's coming from (although they DO need a computer to run the software). According to the Nintendo website:

http://www.nintendo.com/wiiu/features/tech-specs/

Wii U "Supports 1080p, 1080i, 720p, 480p and 480i. Compatible cables include HDMI™, Wii Component Video, Wii S-Video Stereo AV and Wii AV."

The Hauppauge (pronounced HOP- og, if you didn't happen to know) site says the PVR2 will record all these specifications and more:

http://www.hauppauge.com/site/products/data_hdpvr2...

And the Elgato game cap works with all the Wii U outputs as well - see here (Technical Information page):

http://www.elgato.com/gaming/game-capture-hd

Hope this helps you out... Good luck!