Earlier this morning (or late last night in the US), Lightroom 3.3 final was announced, along with Camera Raw 6.3, on Lightroom Journal (the official Adobe blog for Lightroom) by Tom Hogarty. Both are available via the in program updater in Lightroom and Photoshop CS5. You can also download them directly. Also there’s an update for Photoshop CS5 to 12.0.2
There is an extensive list of bug fixes, new camera support (e.g. Canon G2, S95, Nikon D7000, Olympus E-5) and news lens profile over on Lightroom Journal.