I'm not a drummer so I could be talking out my ass right now, but it seems Pat is doing something a lot different for this tour. And besides about adding another tom. The drums seem to have a fuller, deeper sound. I think he's made some big changes to his equipment.
When I saw them live I remember it was very punchy compared to most drummers that I've heard, every thud went straight through me. I haven't seen them before this tour so I can't compare, but watching videos the older stuff seems to have a much thinner sound. Compare anything from the 2005 DVD to 2010. Even stuff from 08-09 is quite a bit different from how he sounds today.
Anyways just wondering if anyone else noticed a difference this tour.