The day will be August 7, 2011 and according to Robb over at TPR, there will be ERT!
ERT is defined as being able to ride a coaster with either not leaving the ride and have to wait in a long line or only having to wait in line for only a minute or so. In a nutshell you can pretty much ride your favorite coaster as much as you want in a given amount of time.
Details, pricing, etc. are said to be announced soon.
I know I definately plan on going to this.