firstly, i think there should be new races to play with. maybe centaurs and dwarves. somehow bring a story to them like the centaurs had to join up with the humans charrs etc to defeat an even more evil then before; maybe there were small dwarven colonies living underground still that nobody could find but they dug themselves out. maybe possibly krait even im not sure.
secondly, i saw a post about character homes. i think that is a genius idea. have certain maps have districts like gw1 had with everyone outpost town etc. and have some mansions cost up to 1000 gold while the moderate homes are about 50gold and maybe some little rackidy shacks that are 10 gold?
lastly, mounts. now while i think flying mounts is kind of a bad idea for gw2 i think walking mounts while be very beneficial. but make them costly. 20 gold at minimum