I did a taste-off with my last bottle of Chaos Theory from batch 001 against one of the 2010 bottles. Some folk had said this year's brew wasn't a patch on the old one.
The latest brew tasted just as good in my opinion. The only difference I could find was that batch 001 was less filtered; there was a slight sediment in the bottle like previous years' bottles of Punk IPA.
One thing I definitely agree with is that it's one of the best IPAs out there.
BrewDog are planning on brewing four different single-hopped IPAs in 2011. There is going to be a Nelson Sauvin hopped one but whether or not it's going to be named Chaos Theory remains to be seen.