Update 2: Nintendo confirms Nintendo Direct for Japan as well. The page mentions Wii U titles for the summer.
Update: Nintendo of America will host a Nintendo Direct tomorrow as well. In addition to Wii U, the 3DS will be featured. Nintendo’s Facebook message states:
“We’re having a Nintendo Direct tomorrow to provide updates on upcoming summer Wii U and Nintendo 3DS games. …We’ll discuss future Wii U titles for fall and onward in a Nintendo Direct before the start of E3 2013.”
It’s that time again – a new Nintendo Direct is coming.
Nintendo UK just tweeted that a Wii U-focused presentation will be steamed tomorrow to highlight spring and summer titles for the console.
— Nintendo UK (@NintendoUK) May 16, 2013