BC Persian reports that Al-Alam TV (Official Iranian state television, but in Arabic) recently showed more pictures of the 15 British marines playing ping-pong and having fun. The new footage shows Lt Felix Carman joking around in front of the cameraman. The interesting part is that Lt Carman was the one who was complaining the most about the way he was being treated in Iran. (picture is taken from BBC's website)
My TV is on and I am switching between CNN and BBC to see if it is reported at all. It seems that it is not.
I found this page on the BBC website which only indicates that more videos are broadcasted, saying that the sailors were "socialising and relaxing".
Update2 (after 24 hours):
BBC didn't show the newly-released videos, but mentioned that more videos were broadcasted by Al-Alam. Nothing more. CNN, on the other hand, did show the footage.
Jon Stewart has a funny show about these British marines: