According to a new post on the official Xsyon site, the game is slated to be released on March 1, 2011. The site is also now accepting preorders for the post-apocalyptic game from Notorious Games.
Modern technology has consumed itself. War has ravaged the planet, opening a rift to another reality. The survivors of the grisly destruction rise from the ashes of ruin to encounter a world that has changed. A world that once existed only in the realm of mythology, legend and imagination has become concrete and very real. You have forgotten the past and are welcomed by a new primitive future.
With the disruption of the planet, ancient gods awake to once again exert their powers over the earth. The lords of nature have revived the wastelands, eradicating and subverting the remnants of modern technology. Creatures of mutation and mythology now populate the land. The ways of swords and sorcery have replaced the path of science and progress.
Read more here.
Thanks Cecropia for the tip!