Richard P posted some pictures from Sunday on wpsmb in the Fall Conditions
thread. Here's his picture near the top of the switchbacks:
His entire set of pics is here.
In that same thread, Richard wrote, "I didn't use any gear last Sunday, but lots of people were using MicroSpikes and crampons."
Checking the Mt Whitney Weather (link to the left) NOAA weather
for Whitney gives a slight chance of snow up high on Friday, and both Dennis Mattinson's weather
and NOAA call for a chance of snow on Sunday.
Based on the above, I'd say Saturday might be a good day to go for it again. Take warm clothing.