Blizzard employees will make special appearances on the TTR near the vendors and Arena promoters, easily spotted as they will be the only characters with Guild tags -- <Blizzard Entertainment> for their Horde team and <Blizzard> for their Alliance team. If you can't spot the Guild tag, you still probably won't have trouble finding them and their gigantic mounts. Drysc says he expects problems to crop up -- it is a stress test, after all -- but that Blizzard is ready to resolve any issues that might arise.
If you haven't gotten onto the TTR, now's a good time to download the PTR client and make your own pimped out Level 70 characters. The more players log on to the TTR during the tournament, the better Blizzard will be able to test their new build and hardware. Plus, it's always good to see what crazy antics Blizzard employees will be up to.