Valve has been unwilling to work with Nintendo on developing any titles for the Wii console. This has mainly been due to the lack of power the console has. However, things are looking much different with Wii U.
"Wii U seems to be a lot more powerful than the previous generation," he told Joystiq. "It sort of fits better into the scalability in terms of graphics performance and CPU performance, so I think it'll be a lot easier for us to fit it into our scalability model." Valve has yet to release any of its games on a Nintendo console, though Gabe told us, "We've always loved Nintendo." He also pointed out that Valve has been slowly transitioning from the PC to console counterparts, starting with Xbox 360 and more recently moving to the PlayStation 3 in a major way with Steam getting ported to Sony's console.
And it looks like Nintendo may be next, as Newell restated, "Now it's a lot easier to look at Wii U and have it fit within that framework." As for us, we're most excited to see what Valve might do with the WiiPad.