Adobe released Lightroom V4.2 yesterday. I backed up my database and upgraded, no issues.
This morning I also found Adobe Camera RAW 7.2 update available for Photoshop.
The underlying RAW processing engine in Lightroom and Camera RAW is actually the same one.
Pros will be glad to see Adobe now supporting the new Leica S Medium Format; and if anyone buys one, the new Nikon J2 is now supported, though with the superior Nikon V1 now available cheaper, I doubt it.
For more details check out, Chris’s quick review and Adobe’s official release pages.