Galactic Reign by Slant Six Games will be taken down from the Windows Store on August 15, a post on the official Xbox forum reads. The turn-based tactical game's servers will be retired on December 31, 2013, at which point Galactic Reign will be shuttered forever.
Slant Six Games, whose last major game prior to Galactic Reign was the poorly received Resident Evil: Operation Raccoon City, instituted a round of "temporary" layoffs back in April with the intent to rehire those affected employees once the Canadian studio had secured new projects. The Twitter and Facebook accounts for Slant Six haven't been active since June, however, portending a more dire situation than we've been lead to believe.
Joystiq has contacted both Microsoft and Slant Six Games to confirm the news. Calling the latter's offices yielded no answer.