Copy of the actual law here.
http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=201520160AB1096
Heavily lobbied by the ready to ride e bike industry, which loves pedelec. Their strategy is to break into the lycra market, which hates throttles.
So class one and three cannot have any throttle. Not even pedelec with additional throttle. Weird. But it's going to lead to local laws that prohibit throttles from trails, both the single track dirt trails, and the local multi use trails.
Throttles will be banned to the street, but limited to 20 mph, THAT SUCKS.
But, it's still an improvement. No need to get a plate to ride 28 mph in CA now. We can easily hide our WOT pushbutton.