GDC Poll: 4.42% of devs plan to launch next game on Wii U. PC Development Insane.

[fleischr]

Correct your OP. Less than 1% on the Wii, not Wii U.

Sad to see the developer interest in WiiU lower than last-gen. Depending on the engine, it takes fairly minimal effort to port a game to WiiU. Maybe that's something Nintendo should promote more.