World preems from Ethan Coen and David Auburn (“Proof”) are among the shows on tap for the 2010-11 season at Off Broadway’s Atlantic Theater Company.Coen, whose last two comedies also played the Atlantic (and drew big crowds there), returns with “Four Pickups” (skedded for April/May 2011), four short plays revolving around pickup trucks. Auburn, best known for his Pulitzer-winning 2001 drama “Proof,” bows an adaptation of “The New York Idea” (previewing Jan. 6 ahead of a Jan. 26 opening), Langdon Mitchell’s 1907 comedy about a young divorcee in the upper echelons of New York society. Also on the bill for the org’s mainstage season is a double-bill of Harold Pinter one-acts, “The Collection” and “A Kind of Alaska” (beginning previews Nov. 3 and opening Nov. 21). Atlantic previously staged a similar double-bill of Pinter plays “The Room” and “Celebration” in a much-acclaimed 2005 production. With the company’s permanent mainstage outpost under renovation next season, the 2010-11 shows that would normally play that space will perform off-site. Venues include the East 13th Street Theater (for the Pinter outing), the Lucille Lortel (“New York Idea”) and Brooklyn’s St. Ann’s Warehouse (which co-produces “Pickups”). Lined up for the Atlantic’s smaller stage, Atlantic Stage 2, are “Bottom of the World” (beginning previews Sept. 3 and opening Sept. 14), a new play by Lucy Thurber about a woman grappling with the death of her sister, as well as “10 X 25,” three evenings of new short plays (25 in all) commissioned to celebrate the Atlantic’s 25th season. Atlantic subscribers also will have access to ticket offers for the upcoming Broadway production of David Mamet’s “A Life in the Theatre,” helmed by Atlantic a.d. Neil Pepe and starring Patrick Stewart and T.R. Knight.