I played through the mission Touching the Sky, defeating Vyrthur and receiving Auriel's bow, and it says I've completed the mission, but i was never given the quest Kindred Judgement.
I'm having the very same issue. I also posted a topic about this, but haven't gotten a response. I'll leave mine open as well, and if I get a response, I'll let you know.
I'll keep trying to fix it myself in the meantime.
Hmmm, with mine the quest didn't pop up until after I talked to Serana, because I had to ask her "Now what?" Then she told me and the quest "Kindred Judgement" popped up.
It seems like a few others are having your problem too. I don't suppose you have an earlier save do you? It might be worth backtracking into an earlier save and see if it triggers.
To the players encountering this problem, which side of the questline are you playing on? Dawnguard or Volkihar? Have you tried talking to either Isran or Lord Harkon (depending on which side you're on)?