It seem that you can get in the beta by simply per-ordering the title. jstevenson quoted "The best way which will give you the earliest access to the beta will involve a pre-order program that should be announced soon", (for those of you who don't know what pre-ordering is, you essentially reserve your copy with five dollars down, and that five dollars will go towards the price of the game when it releases).
Also it seem that people outside of NA will also get this treatment. jstevenson quoted For all of you folks outside of North America are up in arms because Qore is NA only, please don't worry. This is one of many ways to get in, and "we plan to make the beta available in all territories", as we need to test all servers and worldwide play.