Update: 9/1/21 New Photo from @Heather.Dixon.1466
TD Garden hosted a graduation ceremony recently and we can see the new scoreboard hanging in the rafters.
This is the first time seeing it from below and now we know that it will have 4 under-belly screens.
Aside from that, we do not have a lot of specific details about this board yet. It appears to be a conservative board compared to some in the league. We do not see many bells or whistles with this thing, and it certainly doesn't look like it will be among the largest in the league. One thing is certain though, it is a solid design and it will be a nice upgrade from the old, tiny scoreboard the Bruins fans have watched for the past decade.