From reading that, it only applies to transatlantic flights. Once the arrangement is in place, it may as well be applied to European ones as well.
Any idea if Aer Arann will change to Aer Lingus handling in Cork? It would be nice to use the self-service machines to check through. It could also be potentially confusing for some passengers to find that they have an Aer Lingus ticket, but aren't checking in with Aer Lingus.
How is Dublin as a transfer airport nowadays? I haven't switched there in about 18 months, but it used to be a pain to have to go out landside and then have to come back through security again. If they haven't fixed that up, I'd be inclined to continue using Schiphol.