It alternates between "Him" and "Her", just because valve loves trolling us.
That.
Also the awkward poses and purse in the cabinet can just show that the Pyro is mentally unstable. Not that he/she is female.
But I don't want this to turn into a "WHAT GENDER IS THE PYRO" Debate
ON TOPIC
I hope to see Meet the Medic by the next update. (Maybe a Easter Update?
)