To clarify: Do you mean that Arthas will be available in the following unlock, or that he will be available in two weeks "following" the death of Valrithria and Sindragosa?
Great, cant wait to see that cinematic and kill the lich king ^_^.
Keep in mind though, we now share 15 attempts between Lana'thel and Putricide. In two weeks we will share 20 attempts shared between those two, Sindragosa and the Lich King (+5 attempts, +2 bosses, instead of the 5 attempts per boss we got this week). I expect Blizzard to give us 5 attempts ever 1-2 weeks after that, until we reach... 50? My point is, even with Lana'thel being relatively easier (compared to Putricide), by the time Frostwing Halls unlocks, we'll still be struggling getting those two down within 5-6 attempts. Sindragosa is a big gear check, so by the time we get to the Lich King, we'll likely have 1-3 attempts left anyway. Not much room for testing.
The sindragosa fight seems really easy. It's alot like sapphiron, almost exactly like sapphiron in ways of mechanics but she does some thing like the oculus bosses Magic pull (his name escapes me atm) Looks like it will be a good idiot check.
New in-game cinematic EH?Well well well.HmmmThis is starting to turn in my favor (2nd link in sig if you don't get it).
Its like naxxaramas basically, clear the big 3, sindragosa, vampire lady, and prof putri. then you can ascend to the throne, initially they were going to release frozen throne as a last wing. but seems they've changed their mind.