Keith Packard announced earlier today, July 10th, the immediate availability for download and testing of the first Release Candidate of the upcoming XOrg Server 1.13.
The final version of XOrg Server 1.13 will be available in September, and it will have features like support for PRIME DRI2 offloading, RandR 1.5 with support for provider object, support for GLX_ARB_create_context in OpenGL 3.0, new GLX extensions, DDX driver API improvements, USB GPU hot-plugging, better GPU hybrid support, and much more.
Support for XAA acceleration will be removed from XOrg Server 1.13 making the size of the archive much smaller.
The complete changelog for XOrg Server 1.13 RC1 can be found on the official release announcement.
Download XOrg Server 1.13 RC1 right now from Softpedia. Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.