Thoughts and notes:
Unless another high salary is traded or Horton and Rask are taking major discounts at least 3 of Horton, Kelly, Peverley, Jagr and Ference are gone. If keeping Horton it is likely all 4 of the others are gone. I would probably keep Horton. I think it would take $5.5 million on the open market. That is higher than where he should rank, but he is a UFA, GM's are dumb, and you get paid for playoff performance. Hopefully he will stay for ~$5 million for 3 or 4 years. I don't see him getting under 4.75. You maximize your assets that way instead of letting him go for nothing while getting something for Kelly & Peverley.
I don't think either Kelly or Peverley should be amnestied. They should both have some value. They both had low individual shooting %, low on ice shooting %, and bad luck this year while playing a more defensive role than normal (Kelly only had 33% O-Zone faceoffs). They are both experienced veterans, 1+ cup winners, and very valuable on the Faceoffs & the PK. Both are versatile players that should bounce back to their career norms over a full season. They also went from Ryder to Pouliot - who is much better than usually given credit for, to Chris Bourque for a linemate.
Speaking of Bourque as has been mentioned it looks like he is going to the KHL. This does not save the Bruins money on the cap. He hasn't been on the cap since he was sent to Providence. All a one-way deal means is that he was making an NHL salary whether in the NHL or the AHL, not that he counts on the cap either way. He was actually the perfect forward to keep in the press box as he is cheaper than any other current options. You just don't want him on the ice.
As far as I know bonuses are soft so they do gain salary that would carry over to next year if the bonuses are hit. Here is what I have for cap hits without bonuses and the Qualifying offers for some of the contenders for spots:
Caron - $850,500 QO
Daugavins - $698,500 QO
Hamilton - $756,667
Krug - $854,167
Svedberg - $850,000
Spooner & Knight - $785,000
Camper, Camara, Koko, Cunningham are all between $636,667 & $767,500.
The Bruins likely need to use all of Savard's LTIR, and bonus money to "only" lose 3 or 4 good players. Hopefully the combo of players above + Soderberg and/or assets from Kelly, Pevs trade can pick up what they will lose.
Other contracts - Rask is likely getting close to 6 million as most others have assumed. That would make him the 6th highest paid goalie. He has claim to being higher, but is an RFA and has less games than everyone around him. Quick got 10 years - $5.8 million with worse regular season and playoff numbers but about 100 more games experience - and a cup. That is his closest comp and one of the most recent signings, but Rask can only go 8 years at most.
Assuming 5 to 7% growth on the cap for next year and going forward, the Bruins should be pretty good beyond this year. The big ones are Bergeron and Seidenberg. Then only Krejci (and Hamilton will be an RFA). Most of the others shouldn't be big dollar increases. Mostly RFAs and bottom six guys. Looch is up in 2016.
Bergeron getting $5.5 is a pipe dream unless he really is the most unselfish team player ever in the league. He should be and will become the Bruins highest paid forward. He is a top 20 forward in the league which would put him at $6.75 million. I am hoping because he is unselfish and getting 8 years that he takes a discount to $6.25 million. I think he could get $7+ if he wanted to.
Last thoughts - for those thinking trade Boychuk instead, I say no way. Yes he plays with Chara, but that also means he has faced the best competition. His playoff career has shown that he can play without Chara, he can step it up offensively, and that he is tough as nails. He is a great shutdown D worth every penny. People only think he is overpaid because he got more than Seids, and/or they only value offense. Just because Seids got underpaid doesn't mean Boychuk is overpaid. I think he is more important than Kelly or Pevs.
PSK you mentioned Campbell. Last I saw was 6 to 8 week recovery and ready for camp. It has already been a couple weeks overall and 10 days since surgery. Shouldn't have any issues with LTIR there.
I also agree Jagr will not be back. As much as I like him, I just don't see the money at his age or to keep him over Horton. They will go younger and cheaper, maybe with someone else's buyout if Horton isn't brought back.
Svedberg or a cheap backup are the likely goalie options. I think multiple factors will see Khudobin leave. Russia, price, chance for more starts. I don't think he gets much more than he made this year, but the B's need every penny. He still only has 21 career games played. All he has proven is that he is a decent backup over 14 games on a good team. Someone would really be taking a chance giving him starter money and I don't think there are many spots available anyway. He will likely get high end backup money for 1 year with a chance to compete for the starting job, or go to Russia for more money. If they definitely aren't signing him, I would try to trade his rights to get a lottery ticket back.