My favorites are the same as
jtav's - though I give a slight edge to the Patronus scene.
It's Luna doing what she does so well - getting through to Harry when no one else can. She gives him a reason to hope, a reason to continue fighting, which was much more emotionally powerful to me than anything he experienced with Ginny.
If I had to choose any one H/L scene to make it into the DH film, that would be it - though of course I hope there're more than that.

Second choice would be their last scene in the Great Hall. I think they'll almost have to keep the Invisibility Cloak scene due to the Ravenclaw horcrux. I'd also really like to see the scene in Luna's room - I'd love to see Luna in her gown at the wedding too, but if there's anything I see likely getting cut, it's the wedding.