Guy and Bee will die.
I like both Guy and Bee, but I predict that within the next 8 or so issues (Including Obito flashbacks) Both will die.
Kishi would not have put all 8 gates into the Manga just to end it without us being able to see them at their full power and so far we've only seen 3 people capable of using them, Guy, Lee, and Kakashi, and we've only see Kakashi open 1, Lee can open 6 that we know of and Guy is able to open all 8 as he already stated earlier in the fight vs Gedo. Especially now that Madara is on scene they're going to need alot more physical force to go toe to toe with him and Guy is the only one capable of it, I predict he'll die after Lee arives on the scene and die with last words as Asuma did with his team.
Bee Needs to die in order to progress the Storyline nobody wants to see the revival of the 10 tails prevented or only a shell of his real power I love Bee but I'd rather see him extracted and see the full power of the 10 tails over finish the Manga and look back knowing I never got to see the real 10 tails.
If Kakashi does die which I'm not sure he will or really needs to I don't think it will be soon, Not until Sasuke arrives on the scene atleast.