Nintendo Wii U supports 1080p, CPU and GPU confirmed - UPDATE: Spec sheet! 1.5 GB RAM, 3 core PowerPC CPU etc. Thread now includes FREE Icelandic lessons!

[Play4Fun]

Also, note that those are early target specs given to devs and that since then the hardware has recieved a couple of boosts and tweaks.

Someone even said that Nintendo may be trying for 2GB RAM instead of 1.5.
Take with grain of salt.