Adobe have announced the release of Lightoom 4 (LR4). You can find more details here.
They have reduced the price slightly too; the full version costs £237.60, while the upgrade costs £76.25. You can get LR4 even cheaper if you purchase it with one of the CS5 or CS5.5 suites. NAPP members should also be able to receive further discounts on these prices.
Interestingly, Adobe have announced the support of additional cameras including the Nikon D4, D800 and D800e as well as the Canon EOS-1D X, Powershot G1 X, S100 and a handful of Fuji Finepix models.
There is going to be a lot of coverage of the software over the next few days and weeks. DPReview have some coverage already here; Scott Kelby here and Michael Reichmann at Luminous Landscape is already promoting their training course that they have provided for this software since the first version here.