So before I say any of this take it with a grain of salt because the guy that told me this was some random *** who started off telling me he was shocked I didn't know who he was. He claimed he had the fastest run time for some trial about a year ago and hasn't been on until that day. He was very egotistical and I felt like half the *** he said was a lie. Which leads me to this.
During the dungeon run with him he claimed to have met with Bethesda employees to discuss changes he would make to the game and all sorts of other crap I didn't believe but was polite and acted interested. Then he asked me if I wanted to know something about ES6 and told me that Mannimarco is going to be the main villain in the game. He said that's why he is never shown to have died in eso, to preserve him for an appearance in the next game.
Like I said I don't believe anything that came out of his mouth but it was still interesting enough to share