NESN is part-owned by the Bruins, so that is where most (if not the great majority) of the team's games will be seen.
Depending on OLN's schedule of NHL telecasts for the upcoming season, there will probably be three to five regular-season Bruins' games on OLN; those games cannot be shown on NESN.
There have been no locally-produced Bruins' telecasts on over-the-air television since the 2001/2002 season (when WSBK-38 carried the Saturday-night games, plus a handful of other B's contests to bring the WSBK portion of the schedule up to 25 regular-season games).
I have heard nothing to suggest that there will be any locally-produced over-the-air telecasts of Bruins' games this season (although a couple of regular-season games on Saturday afternoons will be shown on WHDH-7 and other NBC affiliates in the New England region as part of NBC's new NHL broadcast-network TV package).
With WSBK and NESN already having a business relationship with the Red Sox (WSBK's Red Sox games are produced for it by NESN, and the Sox games seen on WSBK in the Boston area are seen on NESN in other parts of New England), it would be logical for WSBK and NESN to extend that relationship to the Bruins (with WSBK carrying the Saturday-night games in the Boston area, produced for the station by NESN, with those games being shown on NESN in other parts of New England) but I have heard nothing to suggest that WSBK, or any other Boston TV station, will be doing that for the coming season.