Square Enix will release the latest game from former Valve designer and Portal co-creator Kim Swift, with an official unveiling due this weekend.

The game, which Square's tease dubs "incredibly fascinating and quirky", is being developed at Dark Void developer Airtight Games, where Swift is now a project lead. We'll find out more about the title this Saturday at the PAX Prime show in Seattle.

Swift joined Valve straight out of Washington tech college DigiPen in 2005, where she co-developed Narbacular Drop - the direct inspiration for Portal's basic mechanics. As well as Portal, she also worked on Left 4 Dead 2 before leaving for Airtight back in December 2009.

Airtight's last effort, Capcom-published jet-pack actioner Dark Void, missed the mark when it launched back in January 2010, picking up a scrappy 5/10 from Eurogamer's Dan Pearson.

The developer behind last year's action game Dark Void is working on new games it reckons are triple-A quality.

At least one of the games in development at Airtight Games, which has Portal developer Kim Swift on its books, is for the PC, PlayStation 3 and Xbox 360, a job listing on Gamasutra revealed.

"We are now working on several new AAA titles for a variety of markets," reads the listings. "This is a chance to get on board a unique project with a quality focused development and publishing team."

It also looks likely Airtight's new games will be created using Epic Games' Unreal Engine 3.

Airtight was founded in 2004 by members of the team that produced flight game Crimson Skies. Dark Void, its debut game, was panned by critics and flopped at the till point. Dan Pearson awarded it 5/10 in Eurogamer's review.

Kim Swift, one of the chief architects behind 2007 hit Portal, joined Airtight in 2009 to work on a mystery project.

In November last year, Brad Pitt's production company Plan B Entertainment secured the rights to produce a big screen adaptation of Dark Void.