more exposure, drop the marketing for teens, market it as the most intense skilled fps there is or ever was, market it as hard, fkn hard lol.
crap on about its heritage, remember that quakes been around for awhile so can market to a wider age bracket.
i really like how i've met fraggers in quakelive that are from so many previous quake versions.
anyway so it goes on.
and definately update the sound (if possible)
oh ffs, ok make it look real pretty (marketing for teens :P ), hang on, old people like pretty things too :P