I think the changes they are making for WOTLK are just the tip of the iceberg. Everything I saw as a change in classic and TBC just seemed like a bandaid to stop toxic gameplay. (Ie. I believe we'll be playing a vastly different game than retail by the time WOD comes around.)
The next big change that they need to put some real effort and time into is guilds. GDKP has been around for a while, but its popularity in MMO's across the board is almost standard practice now. With GDKP being this popular, there is almost zero reason to be in a guild or group / raid with guild mates. I care about that green text, but an overwhelming amount of people just dont give a shit. So maybe in Cata when guild perks become available, they actually put some time and effort into that horse shit and reward people for grouping with their guild mates.
The Guild Reward system would be a measure to combat that.