The way I understood it, the prices will be what they would be if you called from your home country. So calling another EU country from abroad would cost you the same as calling that other country from your home country.
that's not what they say in official FAQ, all calls placed abroad are same as domestic calls. calling internationally from home country is not regulated yet, hopefully they will fix this nonsense and cancel international EU calls completely
Calling from your home country to another EU member country is not regulated and you'll pay the old long distance fees.