Hope 343i are using Performance Capture for it's cut-scenes.

This is the technique where the actors voices are captured along with their movements, to give realistic movement in the game. Uncharted uses it and of course all the big movies, like Rise of planet of the Apes.

Halo is fine the way it is.
but any improvements are good, Gameplay > looks.

Didn’t Reach use facial motion capture or something similar?

Yes, and I believe that 343i will use the same, if not better, remember they do have Microsoft backing them, so they may have something better for 343i to use.

I really hope they do. In Uncharted it works wonderfully(even though they don’t use facial recondition but it still is amazing) 343 actually has some people that worked at Naughty Dog, so I hope it’ll make it in.

Given the close tie’s Microsoft and the Halo franchise have with WETA, they should get them to help as they are the best at performance capture. I’m sure they are using it but it would be great if we could get confirmation of that.