Major Nelson, majordomo of all things Xbox, took to his blog this afternoon and posted a detailed list of all the games and events that will be spread out across Microsoft's five booths at this week's Penny Arcade Expo. It's about what you'd expect; Gears of War 3 Horde mode, Forza 4, Mass Effect 3, etc, until you get to the list of Booth 432's XBLA titles. Right near the end, snuggled squarely between Retro City Rampage and War of the Worlds, is an unannounced XBLA port of Sonic CD.

We've reached out to Major Nelson and Sega for comment, but as of yet no additional confirmation has been provided by either party. We suspect they're too enthralled by Sonic CD's masterful theme song to even move, let alone respond to our e mails.

Update: A communique has hit our inbox from Sega PR: "We don't have any details at this time, but we'll be sharing some more information soon."

This article was originally published on Joystiq.

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