I personally hope, if that's really the East coast chapter, that they hold on onto their ideals, but really, are just turning to a bunch of hypocrites...
That's what was bugging me sometimes in FO3. They seem to radiate all that glow as a paladin of peace, a chivalrous order of knights... Yet when I talk to the guard in Underworld (the ghoul settlement in DC), she said that the BoS doesn't like them, even sometimes shooting them (if I remembered correctly)... I guess they don't want to save the wastes as a whole. "Just the humans. Mutants can just sod off." That really bugs me, because, aren't the "mutants" like the ghouls and the super mutants also denizens of the wasteland? (although the latter in DC... Is, well... Nuts -w-')
If that's how they act when they are still "pure", I really wonder how will they act in Boston... It's likely that they may have "regressed" back to the traditional BoS stance of isolationism and tech-elitism... Or worse.
This whole BoS presence in Boston is really, really, intriguing.
On a side note, they are still cool though.