The commissioning team-up from Manhattan Theater Club and Ars Nova has tapped an inaugural lineup that will include buzzy scribes Samuel D. Hunter, Thomas Bradshaw and Adam Bock.Called the Writer’s Room, the initiative pairs longtime nonprofit MTC with upstart new-work spawning ground Ars Nova for a multiyear series of legit commissions. Writers on the roster for the 2012-13 season will include Bock (“A Small Fire,” “The Receptionist”), who’s at work on a new musical with composer Justin Levine. Latter’s tuner “Bonfire Night” received a showcase earlier this fall at the National Alliance for Musical Theater’s annual fest of new fare. Developing new plays for the program are Bradshaw, the controversial writer (“The Bereaved”) whose most recent Gotham outing was “Job”; Hunter, whose much-lauded outing “The Whale” recently wrapped a run at Playwrights Horizons; and Sharyn Rothstein (“The Invested”), part of Ars Nova’s Play Group in 2011-12. The Writer’s Room initiative is part of MTC’s current push to boost its profile as a place for new work, creatives and auds. With the recent run of small-scale musical “Murder Ballad,” MTC reinstated programming in its third and smallest venue, which the org aims to devote to bolder, riskier fare. Ars Nova, meanwhile, is coming off a sold-out run for its latest show, the unconventional tuner “Natasha, Pierre and the Great Comet of 1812.” Further details on the projects involved in the Writer’s Room, and when or where they’ll eventually be produced, remain to be nailed down.