-hardware accelerated Cairo
-pixel shaders
-more G5s (PCIe ones and iMac G5)
-some kind of asymetric support for multicore systems (for number crunching, as described by Krashan)
-ftp server/samba or some way to interchange data by network built in as default

future:
-x86-64 support.
-64bit memory handling
-smp
-box with PowerPC emulator for legacy stuff.
-java (for Eclipse mostly)