I’ll be playing halo 4 at the expo and will be recording
I’m going as well (on the Thursday - will hopefully get to the Dev session for 343i).
You might be out of like with regard to recording though.
I went last year and they wouldn’t let me record Mass Effect 3 despite the fact it was on the show floor (where everything was recordable apparently) and the gameplay was already well known.
But no - took my phone out and was instantly told my staff to stop.
Might be the same with Halo 4 - who knows?!