WanderingJim,
I'm headed up tomorrow. I'm hiking the west approach to Whitney from NAP. I'll give a full trip report as soon as arrive at the portal.
From what I have heard on AllTrails, a hiker has used the 99 switchbacks on the way up from trail camp. He reported using ice axe and crampons. He came down the snow field on his decent. I may use the switchbacks to give an established route if it looks safe. I will bring all my mountaineering equipment and possibly a shovel.
-Mike | 
