Just for clarity, this is what they actually said at BlizzCon that I believe the OP is referring too
I can see how people might think this means she is the boss of 8.1, however it also could have just been referring to the Crucible of the Storm. All it really confirms is that we would be facing her before the expansion is finished. Which could even mean she is intended to be the final bossOriginally Posted by Blizzard Entertainment