There are A LOT of scenes I am looking forward to. It doesn't help that I just reread BD so it's even more fresh in my mind.
So just to name a few:
1) The Wedding
2) Isle Esme
3) Not necessarily scene but all the Jacob & Rosalie banter
4) Seeing more Seth
5) When Jacob gives Edward permission to break the treaty to change Bella & save her life.
6) Bella finally a vampire.
7) Bella's first hunt
8) Renesmee. (Very curious how they will do this.)
9) Emmetts jokes & the arm wrestle
10) All the new vampires, the witnesses.
Ha ha. Yup that's a few. ;)