The final version of the upcoming Amnesia sequel has been submitted for testing and tweaking by thechineseroom, and will be released in Q2 2013.
Writing on the Frictional blog, a spokesperson said that the game, which was originally scheduled for a Halloween release, had transformed into a fully-fledged Amnesia title.
"How come a game meant for Halloween 2012 has been delayed for so long?" the spokesperson writes.
"Originally we thought it would be a short, experimental game set in the universe of Amnesia, but thechineseroom had a vision that was bigger than that.
"As their work progressed, the potential for a much greater project emerged.
"What we ended up with is no longer what we had first imagined, but a fully fledged Amnesia game. A different kind of Amnesia, but definitely not a short experiment."
Set in 1899, Amnesia: A Machine for Pigs sees a wealthy industrialist return home after a disastrous trip in Mexico, and is haunted by dreams of a dark machine that has seemingly come to live.
The title is the successor to Amnesia: The Dark Descent, which was acclaimed for its psychological elements and atmospheric surroundings.
It won several awards at the 2011 Independent Game Festival, and was also part of a recent Humble Indie Bundle.
Amnesia: A Machine For Pigs will be available on PC later this year.
Watch the announcement trailer for Amnesia: A Machine For Pigs below: