Mick Foley, Kevin Nash, Doink and Jim Duggan are the only ones in that photo that are likely to appear.
In fact, I would actually guarantee Foley will be a part of the festivities.
The Rock is a possibility. They knew before WrestleMania that this show was coming and would book him months in advance.
Shawn Michaels and Triple H is confirmed.
Steve Austin, Ric Flair and Sgt. Slaughter are very likely.
The only names that I would actively rule out are Kurt Angle, Hulk Hogan, Mr. Kennedy, Rob Van Dam, Jeff Hardy, and anyone else currently under TNA contracts.