Yes, there's another Star Wars mobile game in the works, and this one will be a collectible card game from Electronic Arts.
Today at E3 2015, Electronic Arts announced plans to release a collectible card mobile game, Star Wars: Galaxy of Heroes. This is just the latest mobile game based on George Lucas's sci-fi franchise. A bunch are already available, and a new one, Star Wars: Uprising was just announced earlier this month for a fall launch.
There are not a lot of details about this new game, but EA promises that Galaxy of Heroes will let players collect cards featuring characters and ships from the prequel movies, the Clone Wars TV series and the classic movie trilogy, and then have players battle with their card decks. No release date for Star Wars: Galaxy of Heroes was announced.