We don't even know when iOS 6.1 will be released so I don't think people should be counting on a jailbreak this week (I wish)
From what they've said, the "beta" that was just released over the weekend is essentially a GM, and a release is imminent. They are thinking the release will be out sometime this week. The "this week" tweet makes things more interesting now. Can't wait to see what they have for us!