Adobe Labs has posted Lightroom 3.2rc. For those of you keeping track, there was no LR 3.1. The number bump is just to keep the "pre dot 0" numbers in tandem between Lightroom and Adobe Camera Raw (its 6.2rc is also now available).
That "rc" stands for release candidate, which is Adobe's term for updates that are almost final and that they expect to bump to final release shortly. In other words, the real 3.2 update will be out soon. Why not wait?
Well, if your camera's among those newly supported in 3.2, you probably want to grab the rc right now. Same goes for those using the newly supported lenses. For the rest of us, it makes sense to hold up a bit.
Aside from the newly supported cameras and lenses, naturally the main difference in 3.2 is lots of bug fixes. The Publish Services export feature has added Facebook to the list of sites to which you can publish directly. Similar service for Flickr was included in LR3.