According to a recent Tweet by Johan Andersson, the technical director on Frostbite at DICE, there's over 15 games in development using the Frostbite 3 engine.
We already know about a few of the games, for example DICE are working on Star Wars: Battlefront and Mirror's Edge 2. There's a couple of Bioware titles, Dragon Age: Inquisition and the next Mass Effect title. Need for Speed: Rivals, Command & Conquer, Plants Vs. Zombies: Garden Warfare and Battlefield 4 all use the tech. That's 8 different games right there, but what about the other 7+? We can speculate that the new Star Wars game from Visceral will use the engine, and whatever Criterion are working on will too. There's a new IP being cooked up by Bioware Edmonton, which might also be among the games referred to. Then, of course, there's the new next-gen IPs that EA has been teasing for a while now.