John,
Some interesting news regarding the 757. My thought is that flying out of DUB is unlikely, unless they really need the range/lift/performance. The Greek islands spring to mind, maybe Medira, but these are pretty nice destinations, not even served by EI currently.
I think we might see some flying on the "off days" from SNN, assuming EI would prefer not to operate the European services on Ws from Cork. Think the FAO only operates twice weekly anyway?