I believe that the Zoos Matter facebook page went private and can't be searched. I used to follow the page without being a member, but the group disappeared after the elephants moved. The Zoo has many email lists, including media, members and non-members.
I was at the Zoo this weekend and only Nikita was out, so a birth would be likely. If the facebook page has a photo and stated it came from a Zoo email, I would guess that a press release will be coming shortly (probably delayed since the media is covering the Rob Ford news). I would also guess that if there is a photo of the cub, it is being hand-raised.
TZFan- I doubt Nikita is pregnant, as she would have been denning around the same time as Aurora. As for the penguins, I think they just got access to next boxes, so the females should start laying soon.
I also noticed on the weekend that there is now a stingray on display in the Americas pavilion in the tank next to the piranhas (where the amazon fish used to be). I think it is a white-blotched river stingray.