[NEED HELP] I have to install wotlk..?

I was playing lorderon when it came out, got my char to level 10, i planned to take the zeplin from brill to ogrimmar and run RfC/RC but when i was ready to leave brill i got on the zeplin and when my client hit the loading screen and then teleported me to the brill graveyard and told me "you need to install WOTLK to go there"(not exact, but pretty much sums it up), when i asked the GMs/mods i was given a responce that said, "We have locked TBC and WoTLK content as lordaeron is a progressive server. WoTLK will come in 2 months, TBC in 1 month." maybe you guys can help me better then GMs