According to Da Perf (yeah...I know...a stretch)...
GSN will air a single Poston To Tell the Truth episode as a tribute Sunday night/Monday morning in the overnight slot of 3:30 a.m. The show is a 1970 syndicated version with Poston substituting in the Orson Bean slot with Bill Cullen, Peggy Cass and Kitty Carlisle.
This is bumping (apparently) an episode of Beat The Clock.
If anyone can navigate GSN's website enough to get an official press release on this, it would be greatly appreciated.