Apple maps has improved hugely in the last few years. But Apple still lags Google on the Maps front, mostly of no fault of their own except that they were into the game too late. But as far as the end user is concerned that cannot be an excuse and Apple needs to something to catch up to Google soon, in this area. And that something is apparently un-manned drones flying around the roads and streets instead of what Google did, i.e. have real People drive around in real cars.
If this whole idea of drones seems far fetched, read along this article on Bloomberg which has some meaty details on this including FAA grants that Apple has acquired to operate drones and acquisitions that Apple completed recently that might possibly be connected to this topic, etc. Generally if there is this so much smoke, there ought to be some fire burning somewhere!