No, I have no idea when HBO will make their next cast announcement.
Two major roles and some small ones remain unfilled as I write.
Looks like I will be flying over to Ireland to watch some of the filming. Still trying to figure out the dates. Since I will be over there anyway, it seems like a good opportunity to meet some of my Irish fans, so I will likely be doing a couple of signings while I'm there. One in Belfast, almost certainly, and maybe a second in Dublin. We'll see what arrangements can be made. Details will here and on my Appearances page, once I know 'em.