I guess many of us were waiting for this: the possibility to use Sigma's excellent…
Adobe Lightroom 5 Released (Tutorial Videos, FAQ, Download Link) – Update
Update: Lightroom 5 should be on sale tomorrow, June 11th: B&H | Adorama | Amazon. For the time being only B&H has pre-order links.
Adobe released Lightroom 5 (download here).
A series of tutorial videos have been put online, they cover all aspects of the Lightroom workflow. A Lightroom 5 FAQ can be read here.