Unravel? I think pretty much every EA game uses Frostbite.
Their other sports games (UFC, Madden, NHL, NBA LIVE) use Ignite.
Tantalus has worked with EA on the Mass Effect 3 port. They teased they are working on a port, so it might be Andromeda. Testing a simultaneous release would be a better indicator of the market than late ports, which is the only thing EA did on the Wii U.
The Wii U port of Mass Effect 3 was done by Straight Right, not Tantalus. Straight Right also did the Wii U port of Deus Ex: Human Revolution.