Keith Packard has announced the release of xorg-server 126.96.36.199, the first X.Org Server 1.15 development snapshot ahead of the official release in the second half of 2013.
The final release of X.Org Server 1.15 isn't likely until September or October of this year, but Keith Packard decided to do this 1.15 snapshot to take care of a previously reported security vulnerability
. Aside from closing out the CVE, there's various other updates too. There isn't anything too extremely exciting about the 1.15 development state but there's some fixes, X Input and XKB updates, and a new ZoomModes monitor option for the X.Org Server configuration.
The first X.Org Server 1.15 development release with its change-log can be found on the X.Org mailing list