Pricing is looking to be complicated and not clear cut. Some of it is free on-device. Some of it is free & rate limited per day. They mentioned in the WWDC inf

Pricing is looking to be complicated and not clear cut. Some of it is free on-device. Some of it is free & rate limited per day. They mentioned in the WWDC infomercial that users with iCloud+ (the storage tier subscriptions, Apple likes to throw random things in with that) will be able to get more uses per day. And some of it developers will pay for.