Quantum Theory demo on PSN now, XBL later

The demo for Tecmo Koei’s Gears of War look-a-like Quantum Theory will arrive on Xbox Live “later this month,” the company’s announced. The PlayStation 3 demo on the other hand has been available on PSN since yesterday.

No reason for the difference was given, nor a more precise release window.

The sampling sees protagonist Syd team up with Filena as the pair battles through the infectious Diablosis.

The game’s out this month: the 24th in Europe, 28th in North America.