So this is pure speculation but lets just see how people would react,
What would people think if Jaina and Lor'themar both die during the event and Varian is gravely wounded.
We know that moria and mekkatorque help lead the allaince into the depths of orgrimmar and I wonder why they say nothing in their audio files to varian. Maybe because he due to injury he never made it that far.
Another thing from the audio file and it could once again be crazy but people think that the "she" in lor'themar and Jaina audio files refers to Warlord Zeala turing on her own towers. What if the she is Sylvanas turing her siege weapons on the reclaimed towers. The reason behind my taught is that Zeala has no command over the Kor'Kron and they would not heed her in destroying what could be vital defense's.
We know Anduin plays a role in the siege, I think this could be the moment they actually push him into a major character role similar to his father.
We know he almost died and was healed by Velen, He trained under Velen and is said to be extremely powerful with the light. Maybe he comes and heals his fathers wounds.
Once again this is pure speculation currently, but I cannot help but think wow Jaina dead and Lor'themar dead would be crazy.