Both Apple and the CA DMV have announced that it is "coming soon." Folks with an Android phone can already add their license to Google Wallet.CA is a lot like Apple in that it takes us FOREVER to implement something new. I read it'll be at least a couple years before it becomes a thing in CA.

Driver’s licenses and state IDs in Apple Wallet are coming soon to California
Beginning this fall, Californians will be able to add their driver’s licenses and state IDs to Apple Wallet.
www.apple.com