Not sure if this was mentioned, but.. what about music? The big thing about MMORPGs is their appeal to people who want to escape reality. Music and good artwork with lush, fully worlds of NPCs, critters, mobs, and other aesthetics combine to create a sense of realism that is similar to what we know in this world.. yet, if done correctly, creates something new altogether. Some games have nailed the music aspect down nicely, I always thought Guild Wars had a nice sound track. The background music must be fitting to the current zone and situation and not just some random bit of classical or jazzy music that always sounds out of place or really boring. It was one of the things that upset me about the early SWG, all those wonderful Star Wars soundtracks and yet the game was void of any music but the annoying in-combat loop (which they later redid and now is a lot more tolerable). EQII has potential for some great music, with the variety of different zones and geographical locations but most of it all sounds the same and it's repetitive and I can't play the game without having some hard rock playing on winamp at the same time or I go to sleep.
So what do we know of the music in HJ? Will it be appropriate and mood setting? Will it allow us to get lost into the minds of our own characters and truly experience a fantasy world where we can mingle with others that have been teleported to this realm? Will we truly experience some place totally new to our senses?