For Mendes, she's taking a role in his upcoming comedy, which is currently and tentatively titled This Must Be the Place. Janney will play "a loud, brassy, decidedly un-PC woman who admittedly has a few screws loose." (Could Mendes have cast that any better?) "She reunites with a former employee in Phoenix, where the expectant mother/employer (Maya Rudolph) begins a tour of the country with her husband (John Krasinski) to find the best place to raise their child."
For Robbins, she's taking part in A Thousand Words -- the comedy where Eddie Murphy finds out that he has exactly one thousand words to speak before he dies. She'll play his boss in the comedy, "a savvy, money-grubbing head of a literary agency." Heh. What's worse than only having a thousand words left to speak? Having this happen when your work relies on words.
But the best casting is what comes after these shoots in LA and Arizona -- she's got a gig in the Broadway adaptation of 9 to 5. That is such ridiculously perfect casting.