The Alien game's twitter recently made a new post saying that there is more to come and not to worry. Not entirely sure what that can mean, but it's at least some hope the sequel won't be the mobile game. If I had to guess, I'd say Blackout is similar to Fallout Shelter being released before Fallout 4. That said, Fallout 4 was already a confirmed thing before Shelter was released. Who knows... maybe the other Alien game is gonna be called "Alien Royale"... dear god no lol

Here's a video