Before this HD video, we just had a bad recording from a movie theater, where the face was blurry and white, and it looked more like a cute alien. Anyway, I am pretty sure that director J.J. Abrams wont show the exact appearance of this alien until the film premieres, like he did with Cloverfield.
Now you can watch the full teaser in good quality:
The letters shown in the camera lens at the end are decoded in the comments of this post.
Post author: Daniel Semper