We probably won't get them till s5. The casting reports are for Ellaria Sands and Oberyn Martell thus far.

I think Lady Nymeria Sands. GRRM has said Janina is a dead ringer for Lady Nym

Actually I think it'll happen in the order of the leeches burned. I think Robb will die first, then Balon and finally Joffrey.
Joffrey will probably be the ep9 of season 4

Athelstan:Vikings, Jon Snow: Wildlings

1)it makes sense to watch a finale over a premiere. You have a whole season of the other show left to watch
2) HBO versus AMC, limited viewership .'Nuff said.
3) if you took into account ALL viewerships (even the illegal viewings) GoT would probably slay TWD hands down. It was the second most pirated show of 2011, and…

I guess now's a good time to mention GoT has zombies too?

If they don't get ASkars to portray Eric the Viking somehow… it'll be sad. A True Blood/Vikings crossover waiting to happen!
Also am I the only one thrown by the name Siggy? 
And will there be complete coverage on this show? I still vote yes.

I'd like regular coverage please. It seems to be nicely shot and has nice production values and well as you said… for the History channel to come up with this, it's rather impressive.