Top Chef Vegas Season Finale Filming in Napa Valley

Today, four current members of Top Chef (Mattin, Hector, Ron, and Michael) were spotted at San Francisco's La Mar having lunch today, and the unconfirmed word on the street is that the cast was up in Napa filming the finale this week. Now, what if—what if—one Thomas Keller was the judge for the finale? After all, Gail Simmons and Tom Colicchio had dinner with him last night, and for the first time, he is on the list of guest judges this year, so wouldn't it make perfect sense to save The Laundryman for the finale?
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Update: Word is that Keller isn't involved (sad), but Napa is indeed the setting.