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There is a new content blocking API in iOS 9 that makes it possible to write third-party ad-blockers.

Apple isn't writing their own, or pre-installing one, or anything like that. (At least, nothing like that has been publicly discussed, and I'd be very surprised if it was something they did.)

In iOS 9 third party apps will be able to install a block list to disable ads in Safari. This shouldn't mean anything special to you since it's not done by default and so it's no different from what has already been the case for over a decade on other systems.

iOS 9 enables content blockers for Safari