Superb start.
You shouldn't tangle the predator + covenant + master chief storylines... that would be very "run-of the mill." Great graphics, but maybe more background detail and/or use of lighting to emphasize your action? Please don't make this just another action flick; rather, take the plot into an interesting spin (and I'm not talking about clever contrivances about bomb plots, take-over-the-world schemes, or one-man-against-the-machine, either). If you are up to the work, I would say keep going and continue this excellent trailer!