Most notably: we want to improve support for multiple graphics boards in a single x86-based Linux PC. This already works very well for some driver combinations.
We want to support natively all other Linux branches, but currently no one in the team has time, skill and hardware to do so.
We want to support all OSs we can. Once again, there has not been a chance outside Linux yet except for several Unixes (AIX,IRIX,Solaris) running the X target and Solaris/DGA.