I think that's one of my favorite parts too. If it ends there, they will have so many people to come see part 2. (as if they weren't already) lol.
Spoiler alert : First part is finishing when Bella (as a vampire now) open her eyes.. Literally all cinema gasp with that ending i am telling ya!
they went a lot farther then i thout they would i well only tell you if you wont me to
i think it will end immediatelly edward injects the venom into bella's heart.
the part two will begin with bella waking up as a new born VAMPIRE