According to ESPN, current Football Director Antoine Smith will get promoted to BC as its new 10th assistant. Smith joined Addazio's staff last year as "Director of Football Initiatives."
I have no idea what "Football Initiatives" means. But all of these new, non-recruiting roles don't really have to be defined (at any school). Usually there is a good deal of film study, since there are also limitations on player interaction. But these types of jobs are different from Graduate Assistants, as they typically get paid better and don't have as much grunt work.
According to ESPN, Smith will work with the DLine. The big advantage of adding him is the new foot on the ground to talk to recruits. Smith has history in the region, having played at Maine and worked at Holy Cross. He was at Texas State prior to BC.
Still no official word from BC, so there could be other developments. I expect BC will also add a few more Football Directors this offseason.