Yeah, pardon me, the software will make use of the new extended functionality of the AMD64. 
Well, I think a 50% speedup is possible when employing 64-bit processing for number crunching tasks. And since VST plugins are mostly doing that, I would love to see my favourite plugins optimised for 64-bit.
Anyhow, I don’t think AMD was kidding when announcing 50% faster processing - take a look at this article.