Is it a big deal that the Shepard who stars in this Mass Effect 3 trailer is the female version? If you’re not familiar with Mass Effect 3 then you can play either a male or female version of the main character but not tinker with her race like you can in many fantasy RPGs. Shepard is human. Female Shepard is voiced by Jennifer Hale.
This trailer for Mass Effect 3 shows Shepard getting reinstated to active service. It’s too late, of course, we know from the end of ME2 and the teasers that the Reapers are on their way.