How excited are people about Paul Downs Colaizzo’s next play? So excited that a guy who usually does classics signed up to direct, and persuaded an Oscar winner to play the lead. Really, Really, Colaizzo’s searingly funny, sucker-punch of a play about self-obsessed millennials won the Helen Hayes Award for Best New Play of 2012. Earlier this year, Zosia Mamet starred in a successful off-Broadway run. Now Signature Theatre has also gotten first dibs on Colaizzo’s second play, a deal that feels more like a coup than a courtesy. Christine Lahti will star as a housewife with secrets in Pride in the Falls of Autrey Mill, a play about trouble in suburban paradise. Michael Kahn, artistic director of the Shakespeare Theatre Company, will miss out on directing STC’s Measure for Measure in order to helm this one.