Yes I've heard of some guilds requiring their players to rush through levelling and the new content, but personally I kinda feel bad for those players. There is nothing in the game that top guilds/players can do that I won't be able to do maybe a couple of weeks later. I just don't get the rush. I understand some players want to get an early advantage on the auction house, but other than that I don't see the point. There is more than enough time to prepare for raiding and enjoy the levelling experience.