I guess many of us were waiting for this: the possibility to use Sigma's excellent…
Adobe Lightroom 4.4 And Camera Raw 7.4 Available For Download
Adobe Lightroom 4.4 (click here to download) and Camera Raw 7.4 (click here to download) have been released to the general public. Support for the Canon EOS-1D C (B&H | Adorama, or rent it here) has been added (among other cameras), and various bug fixes and tweaks are also delivered.
Adobe Lightroom price check: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA