My guess is we might hang out with Y'shtola since she's in charge of peeking into other shards. That being said there's an implication that Alexandria has been enticing or stealing souls from other shards, so we might see that later?

There might be more to Solution 9, as Dawntrail story might end in 7.3, but I don't know if Yoshi P said that we're back at finishing the expansion in the x.3 patch.