[GTC] - Guild-only Block Constructed?

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I'm wondering if WoTC will be implementing a Guild (two colors only) constructed format after the release of Gatecrash, or at latest when "Sinker" falls. This speculation is based on the player-guided Mirrodin Besieged expansion which had players pick a "side" and then recieve side-specific boosters (which already exist in the pre-release guild packages), and the "Choose your Guild" gimmick with the point leaderboard.

I can't imagine they'd place so much emphasis on guilds, especially with the pre-release events, and not create some sort of Guild vs Guild event.