A spinoff series featuring Wilson's character Dwight Schrute - titled The Farm - is currently under consideration for a 2013 pick-up.
Writing on his official Facebook page, Wilson stated: "We are shooting an episode of The Office entitled 'The Farm'. It introduces Schrutes we've never met before - Dwight's sister Fannie and her son Cameron who've been in Boston for 10 years, brother Jeb, a pot farmer, and (Nazi curious) Uncle Heinrich. Also there's Mose's brother Zeke."
The actor praised the "amazing cast" assembled to play Dwight's family and revealed that the potential Farm series would "start airing in the winter / spring probably".
"The number of Office eps I do this last season is really dependent on what happens with The Farm," he added. "Definitely 12 or 13 and maybe more."
The Office is to end after its upcoming ninth season, with showrunner Greg Daniels promising an "exciting" end to the NBC comedy.
The final season premieres on Thursday, September 20 at 9/8c.
> Jenna Fischer "very sentimental" about the end of The Office
> The Office spinoff The Farm casts Dwight's uncle
Watch a clip from The Office below: