As part of today's beta festivities, Bungie for two hours made a new story mission available. Fortunately for those of you that weren't available, I've captured a run of the mission from start to finish for your viewing pleasure. You can see it below.
In case you did miss it and are regretting it, the mission will be available in the full game of course. No word from bungie as to whether or not the mission will appear again before the beta ends.