Unfortunately I am not attending the BlackHat this year, though I’ll try to make it to Defcon. I have been following the presentations pretty closely and so far this is pretty interesting:

WAF testing tool. ~150 ways to attack WAFs. Their product is potentially an interesting alternative in the WAF space.

Presentation on how to use Arduino to hack hotel room keys. And this is his blog.

Looks to be a very useful training tool.