Don't know how reputable they are (they could just be repeating forum gossip) but....
Lots of other fan/gossip sites saying the same thing.
Then again, nothing on Hardy's Twitter. And the TNA website says of the London show,"Worldwide wrestling stars announced for the London event includes Hulk Hogan, Jeff Hardy
, Kurt Angle, Bobby Roode, James Storm, AJ Styles, Mr. Anderson, Rob Van Dam, Velvet Sky and Gail Kim. Many more top names will be added in the coming months" although it does add "All event line-ups are subject to change."
So, sorry - I think it's still up in the air.