Why would anyone expect a redesign beyond possible engineering tweaks? I suspect the rmbp models will displace the older style within 2-3 cycles, but I wouldn't expect another redesign for several years. Right now power management is becoming increasingly aggressive, but I don't expect them to thin things out even further unless sub 20W becomes the norm for notebook cpus in more of an Soc form factor. Touch screen also doesn't make much sense unless you go to a totally different hinge design. Apple has never made back to back changes like that, and with the notebook market softening, it's unlikely that other oems are going to force their hand there.