Just moments ago, WordPress 2.7.1 was released to the public. This releases contains 68 fixed tickets. Nothing really in the way of features as this is more like a maintenance release.
To upgrade if you’re using WordPress 2.7, browse to TOOLS-UPGRADE and click on the upgrade button. I would still back everything up just in case.
Consult the list of fixed tickets and the full set of changes between 2.7 and 2.7.1 for details.
By the way, my initial bet was for the release of 2.7.1 for Monday, February 9th. Looks like I lost the bet but I was darn close.