You can't.
It's not even out in the cinemas yet.
so there is absolutely no way you can watch it online.
sorry.
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http://twilight-saga-breaking-dawn-hd.blogspot.com/
I watched it just yesterday by searching "watch theater releases" at Google, give it a try. I'm sure it'll work.
Breaking Dawn will be the last book from Bella's point of view. Stephenie Meyer is currently writing Midnight Sun, which is Twilight except it is from Edward's point of view. She is also thinking about doing a different series that has the same theme and characters of Twilight, just not with Bella and Edward as the main characters. There is only one more book and it's from Edwards perspective of Twilight it's call Midnight Sun. Stephenie Meyer says she would love to write 20 more Twilight books only she can't. Why? I love twilight!! Blub!
You can watch twilight online for free at alluc.org however it's no ever good quality and I don't no whether or not its legal.
Surprisingly, I watched it on Youtube and it had better quality than everywhere else i looked to watch it. it had no buffering and i have a super slow computer. you should try here.