I have wondered the same thing, I am due to receive the new VP180 shortly and was told by Jean-Claude that they would match up great with my M80s Tis. So there cannot be that much difference. I purchased my M80s in Sept 2004 and like Jay mentioned a lot of the changes may well be in the M80s I have now.
M80s VP180 QS8 SVS Elevation Spk. SVS PC13 Ultrax2 Anthem 1120,Oppo 205 ADA Amp LG OLED 65"