We pay just 10% commission for domestic bookings and I understand that if you accept international (optional) you pay 15% for those. So are we saying the move is from 10% to 17%, as I have seen nothing in writing about it, or is it the 15% international moving to 17%?

I think it likely Expedia will move the domestic to 12% in line with Wotif and Booking.com and the international from 15% to 17%