I would prefer they adopt the EverQuest style of allowing a fully customizable interface, which they spearheaded LONG before WoW was even an idea.
But yes, honestly, the chat interface simply sucks. I would like either a larger chat box or multiple chat boxes. At 1920x1080 with a maximum of 12 lines of text in a 4"x3" corner of the screen just hurts my eyes sitting 2 feet away from the monitor. In any case, texture depth selection for the backgrounds would be nice too since purple on desert orange really freaking hurts my brain in Scorching Wind Desert.