Many Android phones (Nexus One, HTC Incredible) when they got an upgrade to the newer version of Android they actually improved in performance (such as speed and battery life). It could be a chance that the Vox might improve as well with icecream sandwich if it has the proper hardware to support it.
I agree with everyone else though, you would probably have to wait for someone to hack the Vox to put 4.0 on. By that time maybe someone might figure out how to overclock the processor. Now a Vox with Icecream sandwich and a over clocked possessor - that be something to salivate over
