The latest news on this front comes from a really interesting article at Ballot Access News written by the widely-respected election expert and advocate for third party/independent ballot access Richard Winger:

On August 30, the California Senate Appropriations Committee passed AB 1451, the bill to make it more difficult for initiatives to get on the statewide ballot. It requires that at least 10% of the signatures must be collected by unpaid individuals. It also outlaws paying circulators on a per-signature basis.