Yep it started life as the MD95 and incorporates a bunch of bits from other programmes... DC9-30 fuselage and wings MD87 tail MD90 tailcone MD11 flight deck (nadged about a bit) and then the BR715 engines an all new bit - they also changed a bunch of other stuff to improve maintainability.
Right now they are producing at a low rate (~I think the backlog is about 40 or so) and are banking on a big order from the Star Alliance carriers in fact they're even talking about a stretch if it comes off ...the order that is...