If you ask me, all I can imagine them wanting to change is:
a) A chassis mounted steering servo (ala the MTX-3) for lower CG,
b) The rear upper suspension revisions for adjustable track width, as discussed earlier in this thread,
c) Another revision for the front FC blocks (which people still seem to be having a problem with).
d) revise the battery tray mounting issue, which some people also have had problems with.