Adventure Tactics, a soloable skirmish game, will soon receive its first expansion, Adventure in Alchemy, to be Kickstarted in the near future. It will add a new yet short campaign of about six encounters, a new set of side quests (one-shot missions), a new starting class, and AI-controlled ally decks.
This second campaign shouldn't be the last though, and a third one is already planned, potentially bringing in the ability to play the game in a "true solo" fashion (right now, you have to multi-hand three characters).
There is very little available info so far, so here is just a picture of the core game for embellishing purposes.
The campaign will launch on May 25th.