They are Atlas, the short, round, blue-eyed one, and P-body, the tall, thin, red-eyed one. Now, watch this amusing trailer that doesn't really show anything new, but reminds us that Portal 2 still isn't out and that makes us sad. Thanks for that, Valve.
BOOM video 7462
Portal 2 was recently delayed from February and will now be released on April 20 in the US and on April 22 in Europe for the PC, Mac, PS3, and Xbox 360.
http://half-life.wikia.com/wiki/ATLAS_and_P-body Anatomy A-rand Physiology P-body I think they may be a reference...
lols :P