"Our goal for Unreal Engine 4 console-wise is next-gen consoles," he explained to Kotaku. "That's really what our energies are focused on. If you want to make a Wii U game, we have Unreal Engine 3, and it's powering some of the best games on the Wii U already."
Battlefield series executive producer Patrick Bach told Eurogamer this week that not only is Battlefield 4 not coming to Wii U, the new Frostbite 3 engine on which it runs is also not designed for Wii U. "We right now don't have support for the Wii U in the Frostbite engine," he said. "The reason for that is it takes development time."
Update: Rein spoke with Engadget and clarified his comment from the presentation, noting that it's totally possible to run Unreal Engine 4 games on Wii U. "You heard the stupid gaffe yesterday about the Wii U," he said. "If someone wants to take Unreal Engine 4 and ship a game on Wii U, they can! If they wanna ship an Unreal Engine 4 game on Xbox 360, they could make it happen."