The writer confirmed on Twitter that the show would return to the BBC during 2012.
"Oh, and we've finished writing 7 eps of The Thick of It, to be shown on BBC2 later this year," he said.
Earlier today, the Caterham F1 team's Head of Communications Tom Webb claimed to have spotted Peter Capaldi in Westminster being filmed in character for the upcoming fourth series.
"In London for meetings & just passed MASSIVE news - Malcolm Tucker filming new scened for The Thick Of It outside Portcullis House. YES!! (sic)," he wrote.
Actor Chris Addison last year told Digital Spy that the next series of the show would start filming this spring.
Earlier this month, it emerged that BBC America had received viewer complaints for bleeping out the swear words in its US broadcasts of the show.
Watch some classic Malcolm Tucker abuse below (warning: contains very strong language):