I've heard Dillane is several years older as well than Mark Abby but I don't think that makes much of a difference since they will never appear together on-screen and Abby was made to look older as Robert. I'm looking forward to seeing Dillane's performance, I thought he was a great as Thomas Jefferson in the John Adams mini-series.
I've mentioned this before but I actually pictured the actor who plays Jorah Mormont as Davos Seaworth. That Iain Glen looks like he could be the lead in Shogun if they ever remade that series.
I wondered where Asha...I mean, YARA Greyjoy was in those pictures but I suspect now that they want to keep that under wraps, given the...interesting way she's introduced in A Clash of Kings.