I think we can say that Sakura will have another role yet aside from the OR and NS parallel coming up.
It's very probable that she'll be the one saving Shikamaru, and either fighting/supporting Naruto, or she and Tsunade will have a cooperation. The latter I don't think it's that much possible though.
Bolded: In order for the OR oarallel to happen, Sakura have to interfere and her jumping in front of Naruto is very possible. Only if Obito knew already that Naruto loves her and goes to kill her to affect Naruto, or noticed something from Naruto.
Not necessarily. I can't recall who said it, but someone mentioned something like Sakura sacrificing herself for the greater good, like Rin did in order to protect Konoha from the three-tails inside her. I'm not sure how that might happen though.