Will it begin with the classic opening crawl?

Yes according to Ashoka a poster here:
There is a montage like the 2D show showing different battles in the Clone Wars and I'm guessing there will kind of be a news-reel narration like the show will have.

 

I'll give up! I'm not sure if the final showing would be the same, since what we watched was "Pre-edited".

Did someone mention "No Grievous"? But hey! He's in the trailers! The webdocs! And even one of the TV Spot!

Does that give you a clue? (And more slip to join the wicked Count Cooku ).

And why, in the midst of a movie with already 3 planets to battle on... Is there a shot of 2 Jedis hanging about on a Death Star? And why more are they so brief? I wonder now...

 

Did the opening go something like this?:

Space battle, separatists on cruiser, zoom out shot with Palpatine, Mace, and Obi-Wan, Kit Fisto and Plo Koon fighting on the "Death Star", then Jabba's son getting kidnapped by the squid ship?

I've seen this footage as well from the Comic Con presentation video on some website you can see in in there. I'll find a link.

Edit: here it is from same website as George and Dave interview. There's footage from 5:12-5:35. It's in the middle. Also there's other clips around it.
http://enewsi.com/news.php?catid=194&itemid=13685

 

Wait, I can't tell if you are being sarcastic or not - is Grievous in the movie? This is the one thing I would really like to know. I'm afraid that his appearance in the trailer was just from the show, and put in the trailer for the heck of it. I'm sure he makes just a small appearance, but I'm curious.

 

I sure hope it'll start with the opening crawl! Then it'll really feel like a live-action Star Wars film!

 

I'm sorry to say that it will not be opening with the classic crawl. Apparently there will be something different.