Hemphill posted a picture of the front page of the script for the show with the caption "Anyone know any good jokes?" on Twitter today.
The duo will play 21 shows at the SSE Hydro in Glasgow later this year. Ticket sales for the dates have almost hit the £10m mark.
The news follows the death of Kiernan's 12-year-old son Sonny, who was found dead at the family home in January.
Still Game was a massive hit when it ran between 2002 and 2007.