BigTnaples
Todd Howard's Secret GAF Account
Yes. They've explicitly said that the focus for the beta is gameplay. This is a really early beta - the game isn't out for 12 months. It'll be at least 900p by launch.
I fully expect it to be in between 900p-1080p by launch.
That said I don't expect them to in addition to increasing te pixel count by millions, to also upgrade the baseline graphical fidelity to a point that is impressive.
The Beta looks all to similar to Halo 4 running on the MCC right now. In fact, barely distinguishable aside from the different art direction IMO.
I don't expect them to go from that at 720p to an absolutely stunning Halo game running at much higher resolution a year from now. And neither should you frankly.