This story lists: Adam Goldberg, Ana Gasteyer, Bobby Moynihan, D.L. Hughley, Debra Messing, Edie Falco, Horatio Sanz, Isaac Mizrahi, J.B. Smoove, Jenna Fischer, Rosie O'Donnell, Sherri Shepherd, Sutton Foster and Tituss Burgess.
I recognize some of the names from the genre. Sherri and D.L. hosted game shows, though the latter probably wishes he could forget the effort (TBS's disastrous Trust Me, I'm a Game Show Host.) There are also a few players from Celebrity Name Game, which seems to be the AAA team for ABC's game shows this summer.
It's really hard to say how any of these folks will perform on the show, because Match Game is such an ensemble format. A celeb who tries too hard or hogs too much camera time can spoil everything. I assume the producers will sit pretty hard on somebody like Rosie O'Donnell, who might be inclined to a rant or three.
Alec Baldwin calls the proceedings to order on June 26. As Johnny Olson used to say, get ready.