Keith Carradine will return as Wyatt “for a moment,” according to the actor in comments to TVLine.
While I wouldn’t rule out more than one episode with Penny’s dad in the mix, I don’t expect to see a ton of him.
That doesn’t come as a huge surprise; The Big Bang Theory has a large cast with stories that will need to be wrapped up by the end of the season, and that may not leave a whole lot of room for other characters to take on big roles.
No details are currently available about when in Season 12 Carradine will return as Wyatt or if he’ll be back for more than one episode, but his “for a moment” comment seems to indicate that he won’t be back on a regular basis.