While the application states that the mark is to be used for an "on-line computer game," it's unclear whether that means a PC game, a game destined for one of the Xbox consoles or something else. Gamespot contacted Microsoft for further information, and were met with a boilerplate "no comment." "Microsoft often acquires various trademarks as part of its ongoing business strategy, but beyond that we have no comment," stated the company's representatives.
Much as we'd like to blow open Microsoft's cover story with vital insight, there just isn't enough information currently available to deduce what exactly "Screamride" might be. We'll keep you updated as new information comes to light.