Considering how Fromsoft makes their DLC i dont expect anything new, its probably going to offer a bit bigger size like 2-3 legacy dungeons with 2-3 mini dungeons such as castles and big caves.
I wish Fromsoft surprise us with unique DLC build, they always tend to do the obvious same formula since 2011, add 3 areas, add 4 harder bosses, add few weapons, call it quit.
Lets hope they add something new this time, new mechanics, new gameplay perspective, perhaps time travel or something entirely new.
But in any case, the standard formula is fine too, as its pretty solid.