If the schedule for the new baby panda cub is anything like his/her sister, Su Lin, it may be end of December / January before the baby panda cub will be on outside exhibit. And even then, it will be hit or miss, because baby panda cubs like to sleep high in the trees.
I remember two years ago, we went in Feb when Su Lin was 6 months, we had a hard time seeing her because she was always up in the tree. We had to go back several times that day to catch her on the ground - feeding with mom.
I love the Pandas at San Diego! My friend and I have flown down for the day to San Diego just to celebrate Su Lin's 1st & 2nd birthday!
Check the San Diego Zoo Panda Blog and they will definately mention when the panda cub will be on exhibit.