NBC's new Amy Poehler comedy is still on track to debut this spring—and it's just added another cast member.

In an interview with TelevisionWeek, NBC Entertainment co-chairman Ben Silverman said Ms. Poehler's untitled comedy will begin filming its pilot episode in January. He also said the show is still on track to premiere next spring.

There had been industry speculation that the series—which is being produced by Greg Daniels and Michael Schur of "The Office"—might be pushed to fall. Mr. Silverman, however, said the writers are making good progress and that the show will be ready to air sometime this season.

Meanwhile, the New York Post's Page Six reported Tuesday that former "Office" regular Rashida Jones will be joining the cast of Ms. Poehler's project. According to blog Officetally.com, Ms. Jones will play a nurse named Ann.

"Rashida is funny, talented and beautiful," said Mr. Schur. "She is perfect for this new show, which—just to remind everyone—is not a spinoff of 'The Office.' It is a spinoff of 'M*A*S*H,' called 'Seinfeld II.'"

(Editor: Baumann; updated with quote Nov. 19 at 7:20 a.m.)