Few questions regarding TBC release

Hey guys, I'm new here but was just wondering if someone can clarify certain things about the soon to be released TBC server. I logged in currently on what I assume was either pre-patch or some coded version of WOTLK, well my concern is are things hard coded like that suppose to be, like I couldn't change my resolution settings at all, video settings in it's self are very limited and interface as well looks different. But pretty much I'm confused I played a lot of TBC even a few weeks ago on different servers and the one I currently logged in to was very different, of course it's not TBC yet it was Vanilla I think, but I'm asking this. Is the server in terms of settings and addons that u can put and stuff like that going to be just like any other TBC server