DRI2 is the new DRI (Direct Rendering Infrastructure) design that was originally drafted at the X Developer Summit (XDS) last year. One of the requirements for DRI2 is the use of the TTM memory manager. More technical information is available on the X.Org Wiki. More information on the DRI2 merger plans can be read in Kristian's message.
Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.