Re: Urban outs the villain. Maybe.
Unless Vulcan is near the edge of the Milky Way, it would have to be a different Delta Vega. But no mention is made that it is different than the one in the movie.
Yes, Mitchell still dies on Delta Vega. Missed the first part of your post entirely.
"...the most elementary and valuable statement in science, the beginning of wisdom, is I do not know." - Lt. Commander Data, "Where Silence Has Lease"