Well let's see, based on injuries and growth;
Rask - will be right about where he was this year
Chara - will take a step back
Marchand - will be right about where he was this year, maybe less offense but more consistency and hopefully less garbage that keeps him from playing
Bergeron - due to injuries, he was kept from putting up a season best for himself, not worried about him next year
Pastrnak - getting stronger and more sound defensively - will take a step forward
Heinen - has seen a full season, on the ice and in the stands, got a taste of playoff action. Will take another step
DeBrusk - will be a main contributor and put up 50-60 points next season, improvement
Nash - Riley and Rick out - downgrade for the team
Donato - in - got his taste and will be a contributor - look for him to put up 20/20 and struggle at times - a positive but doesn't replace Rick AND Riley
Kuraly - only getting better - same with the rest of the 50's line, not concerned with them
Backes had an injury riddled season so if he can stay healthy that's an improvement - but he's the biggest question mark in my mind
Krejci - with potentially DeBrusk and donato on his wings he has no excuses not to contribute. Next season is make or break for him, his no move/trade expires after next season -second biggest wild card behind Backes
Charlie - knee should be better and full off season of training with the knowledge of how long and grueling the NHL season is and what it's like to play in tight playoff hockey when your team and you also have expectations set. He'll be an improvement
Carlo - looked great leading up to his ankle break, as long as he rehabs correctly, he might be our best shut down guy next year
Gryz is the wild card on defense - he could improve or he could show that this year was an anomaly. If it's the former, we're in good shape
Miller and McQuaid will give you what you expect , both stepped up this year when they were needed and neither should be relied on as a top 3 minutes getter
Krug - this is a big year for him. He needs to step up defensively in the place of chara fading and he needs to eat more minutes and play well throughout the year.
I think the Bruins will regress a bit in terms of points, they'll likely fight Toronto for that 2nd spot rather than Tampa for first, but will be better overall when it comes to the playoffs
At the end of the day, it'll come down to injuries and youth contribution. Can the older guys stay healthy and can the youth avoid sophomore slumps and take the next step?
Not sure what options Sweeney has in free agency...seems he's damned either way given so many of the hindsight comments on dealing for Nash , which would make me laugh if they weren't so annoying, so hopefully guys like Heinen, DeBrusk, Carlo, Charlie can be major contributors and not just playing over their heads like some did at times this season