As per recent releases, Adobe are sending out Release Candidate versions of forthcoming software. These have been tested, but are being put before a wider audience in case of missed major bugs.
Additionally, this is the first showing of the Adobe Lens Profile downloader. This companion application allows users to download, rate and comment on lens profiles for Lightroom, Camera Raw and Photoshop.
Newly supported cameras include
More information can be had at Lightroom Journal, or from the individual pages on Adobe Labs: Lightroom 3.3, Camera Raw 6.3, Lens Profiler Downloader
Argh! Why did they make the Lens Profile Downloader require Adobe AIR?! I won’t be using THAT any time soon.