At the end of their press-only gathering, Nintendo decided to hold a "one more thing" surprise. Promising more info on a long-awaited series, the audience held their breath as a screen from Wii Fit was shown.

Nintendo was trolling us, apparently. The camera zooms out, showing Mario and Link trying to follow along with the female trainer's instructions. And then: the surprise. Wii Fit Trainer will be the next character to join the Smash Bros roster.

Read more: 'Her moves are very fitness-based' »

The Wii Fit franchise is getting yet another accessory to accompany your Balance Board. Included with Wii Fit U for Wii U is the "Fit Meter," a device similar to Nike Fuel (or the Pokewalker). This peripheral will keep track of your physical activity throughout the day, and then transfer the data to your Wii U when you get back home.

Read more: Coming in first half of 2013 »

Nintendo is following up its popular Wii Fit game with Wii Fit U, and showed off the game at its E3 press briefing. The controller was shown working in concert with the balance board in a variety of ways, including serving as its own screen for work-outs while others watch TV.

A few new sports were shown including the luge, and the Wii U controller could be used to sync with a pedometer to track walks and runs away from the system. Most of the functions shown involved the Balance Board itself, with the Wii U controller sitting idly by while the TV was in use.

Watch: The latest Wii Fit »

Nintendo announced that it has secured another legal victory today, after a Maryland US District judge dismissed a patent infringement suit against the company. The suit from IA Labs CA, LLC had alleged that various Nintendo products including Wii Fit, Wii Fit Plus, and the Balance Board accessory infringed on one of its patents.

"We refuse to succumb to patent trolls," said Nintendo's senior VP of legal & general counsel Rick Flamm.

Read more: Nintendo's third consecutive patent victory »