I know you can't see me, but I just threw up jazz hands and sassed out "Glacier Blast" while sitting alone in my office. I regret doing so. I hope no one was watching.
What is Glacier Blast? Your guess is as good as mine, though I'll bet it has always-on functionality [zing!]. Gamespot spotted this game (see what I did there?) trademark as well as a related domain name registration: www.GlacierBlastGame.com. They picked the URL up at the end of March.
Of course, Microsoft isn't talking about this.
I'd love to hear your best guesses on what you think Glacier Blast might be.