Why would we kill crucia again so soon though? Just seems wierd, I haven't done so in FT, but it just seems like a weird thing to do honestly.
So I actually really dislike the whole 'x was only a setback' way of reusing old lore figures - once they're dead they're dead and I like it that way. That being said, even from the start Crucia was never killed in FT. Her whole thing is that she exists as a kind of hive mind, and is capable of invading the minds of others. We destroyed the body she was currently inhabiting, and she just took over a new one; whether or not it is even possible to kill Crucia remains up in the air.
I don't know to what extent similar logic applies to the other dragons, but given what I've gathered from the Dendrome storyline I think that's a characteristic of Crucia. It ties into some 'very' interesting lore pieces about the relationships between various powerful figures - I'll let you investigate that on your own, but I will note that there is a 6th 'missing' member of the Vigil mentioned in various parts of Tempest Bay and in the Dendrome, and that all this plays into the idea that she has been in far more control of events behind the scenes than anyone realised, probably even back to before the Brevanes initially built the Infinity Gate.
God I hope it's not Crucia again in the new 20mans, even WoW leaves it a few years before they rehash content
Its not rehashed content. Crucia the dragon is dead. However if people actually played the content (I mean its a solo chronicle people, its not hard) they would know from A Hero Rises that after Crucia the dragon is slain she uses the Infinity Gate to channel her essence into Queen Miela, taking control of her. She then leaves Tempest Bay through a teleporter. So you will be fighting this human form Crucia.
I did the Volan fight last night (the zone event) and at the end his essence appears to be pulled into an air rift. Nothing is really said about it, but if you do the event before the 20 man fight he sorta...rematerializes from the power we send into the infinity gate. Interesting stuff lore wise.
The Proteus fight looks like alot of fun. It reminded me of Grug, movement based but it had some Akylios like mechanics. The other fight "(at the infinity gate) seemed to be a add based fight. I never got to the part where the boss shows up.