[2019] So...We are getting new "content" and content

Don’t worry, as far as I know we’re not!

Can’t use the boost on an Unconquered character!

You’ll need an open and unlocked slot to make an Unconquered character; it’s not a new server like the Sagas.

The vanity rewards from leveling up your Unconquered character should be claimable for the rest of the account. As they’re both 2HE, you can make an Axe look like a Sword and vice-versa, yes.

The delete character button have moved to the bottom right of the screen! If it’s not there you will have to disable any custom UI you might have.

You should just be able to turn them off in your interface options? If that’s not working then that’s a bug. Unless you’re using a custom UI, then I don’t know what hocus-pocus that might cause

As you get the rewards they should become claimable IIRC. Not everything is granted at 80. My understanding is that you get armor sets at 20, 40, 60 and then 80, and the weapons are at 80.

All classes receive the same vanity armor appearances, yes. You get vanity weapons at 80 based on what weapons your class can use.