If display configuration doesn't interest you though, the Silicon Motion X.Org driver now has support for EXA acceleration. Should you still be interested in XAA, there are a few fixes in this new driver for the XFree86 Acceleration Architecture. The 1.7.0 driver release also introduces support for the SMI 50x ASICs.
Besides these major features there are a number of other small additions and many bug-fixes found in xf86-video-siliconmotion 1.7.0. In total there are over 120 changes in this driver update alone.
To look at the change-log and release announcement, head on over to the X.Org mailing list archives.