Project Eternity. However, if inExile's spiritual successor to Planescape: Torment, Torment: Tides of Numenera, reaches the $3.5M stretch goal, Avellone will be signed on to work on it as well.
Avellone was one of the key developers who worked on the original Planescape: Torment, so inExile was keen to have him, but didn't know if he'd be available due to his commitments on his own project.
"...As recently as a couple weeks ago (16 days to be precise), we didn’t know whether Torment would even fund. And besides, Chris’s commitment to Project Eternity made it unclear whether he’d have the time," explained the blog post, "Given his key role in Planescape: Torment, and the respect he has earned from the game’s fans, we didn’t want to even hint that Chris might be involved unless we were certain it would be possible. Our unexpectedly strong start – because of you – made it an option we could explore. So explore we did. We’ve been able to work out the scheduling matters so that Chris can contribute to Torment without impacting Project Eternity."
According to the post, Avellone will have two jobs on the game. "First, he will be reviewing and providing feedback on all creative elements of the game, including the story, characters, and areas. His input will be invaluable as a resource to Colin in further detailing the creative vision for the game. Second, he’ll be designing and writing an eighth companion for the game, working with Colin and Monte to craft a companion ideal for both Torment and the Ninth World of Numenera," explained the post.
Torment: Tides of Numenera is currently just over $2.8M in funding with 14 days to go.