UPDATE (8/31) - Microsoft has confirmed to Shacknews that September 14 is the worldwide release date.
ORIGINAL STORY - The Xbox Live Arcade version of the Saturn classic Radiant Silvergun has been dated and priced, at least for Japan. The remake will hit on September 14, for $15 (1200 MSP). It features revamped high-def visuals and online co-op play. Radiant Silvergun was a cult hit in its day, revered for its weapons, clever boss fights, and enemy chaining system.
Shacknews has contacted Microsoft to confirm the global release date. Prices, on the other hand, are generally universal thanks to Microsoft's spacebucks, so we don't expect that to change.