In fact, the PC exclusive title he talks with perhaps a "support game" on Xbox Live Arcade doesn't seem to be what the PC gaming community wants at all.
But when pressed for specifics, Lobb was much more evasive—and actually a little puzzling. Rock, Paper, Shotgun asked if Microsoft's renewed PC focus would spell the end of Xbox exclusives. Lobb replied that developers ought to make "the best thing for each platform" and perhaps release "support games" for "side platforms." He then clarified that the PC was by no means a "side platform" and that we could "potentially" see a big PC exclusive with an Xbox Live Arcade support title.
Finally, Lobb vaguely hinted at a major upcoming PC release, saying that, although he couldn't announce anything, Microsoft is "very dedicated to that space."