Whilst I'm pleased they're using the data (though attribution would be nice), I'm concerned that they'll start updating the maps themselves and not contribute their work back to the community. Will have to wait and see I suppose - I'm unsure what the license for OSM data is.
The OSM data that Apple are using is from 2 years ago. That would be under CC-BY-SA. Attribution is not 'nice', it is legally required (i.e. copyright infrigment if not attribute).
OSM is changing to ODbL soon (since CC doesn't make a lot of sense for this sort of data)
