While we wait on a full review from Anandtech, I thought I'd throw my hat in the ring. If anyone is wondering how fast ThunderBolt is, I can definitvely answer. ThunderBolt is really fast. Absurdly fast. I've migrated my home directory over to a 12 terabyte Promise Pegasus R6 and it's unbelievable. Booting from a SSD and accessing your home folder from a 6 disk array over a dual channel 10 gigabit interconnect is quite quick. Really amazing.
I left the R6 set as a RAID 5 volume. I can only imagine what it would do as a RAID 0. Here's a run from QuickBench:
It's a good looking piece of hardware as well, and nicely matches my iMac.
All that over a single cable. Amazing.