That is sad news, hopefully the polar bears will have a baby this year as the pregnancy hasn't been foiled yet.
Betsy have the Mang mountain vipers been moved to Panda Trek yet? I am curious to see if any upgrades have been made and if its still in this sad state: http://www.zoochat.com/39/p1020284-228707/
Also, would it be possible to see how the plants are growing in with some more photos?
EDIT: Also, some old news:
Will 2015 expo make Balboa Park a 5-star attraction? | SignOnSanDiego.com
Apparently the zoo hopes to open a new exhibit for koalas and bring back Tasmanian devils by 2013.
I did the best I could getting these pictures. The glare off the glass was harsh. I hope you can see that not only are the plants not growing they seem to be dying. There is still bamboo on the top.