I don't know if anyone else noticed this, but quite a few 'missing' superstars are featured on the promo video. Kelly Kelly, The Miz and Rey Mysterio are featured in the promo. Kelly's actually featured quite heavily even though she's been missing for weeks (taking time off).
She's at 0:11 and 0:28 (a quick video of her holding the title).
Mysterio is shown 619'in R-Truth at 0:29
Miz is at 0.13, 0.25.
I know it's an anniversary edition, which could explain why mysterio's included, but besides Mysterio and Triple H, everyone else is on the current roster which would rule out any replies saying he's just on there because of his past at summerslam.
Oddly enough, there's no mention of Orton or Jericho on there - even though it's rumoured they will be a part of it.
Could be possible that Mysterio will make a long awaited return. (personally, he will add a little more star power to the WWE) as well as an appearance from Miz and Kelly (hopefully to write her off storylines).