The Sacramento Bee offers this report. A snippet:

Attorney Lance Olson, who represented Democratic legislative leaders in the suit, called the Supreme Court ruling “nworkable”because it provides no clear standard for lower courts.
“he message is, you might as well go to the Supreme Court each time you think there’s a problem with an initiative,”Olson said.
“They obviously made the decision back before the election to put it on the ballot, and they had to justify that,”he said.

My earlier analysis of the court’s decision is here.