Zoo Atlanta is also preparing for giant panda breeding season. Here is an update by Rebecca Snyder, Curator of Mammals:
So far, Lun Lun is not showing any behavioral changes indicative of estrus. We are monitoring her behavior and will soon be sending out the first batch of urine samples for hormonal assay. Po has adjusted well to life on his own. This morning I watched him methodically eat a very large diameter piece of yellow groove bamboo. It’s impressive to see how strong he is and how proficient he is. It takes great strength and skill to handle, break, and strip a large bamboo culm. He seemed to be enjoying it very much. I expect he took a long nap after all that eating.
Source: Zoo Atlanta