I only saw one cub, however most of the time that I spent watching this enclosure, there was only the female showing, and the cub only came out for a short amount of time to wander around before going back into the den. This picture was taken about two and a half weeks ago though, so the cub may be a bit bolder now.
Yes, I agree- especially as I wasn't sure if there really was a successful breeding until this actually confirms it. as I can't see that they have announced it anywhere on their website or facebook pages yet .