I believe LE is correct. A closed beta is best for now. Once RoK comes out then we can freeze the project there until we get it up and running. With 1 year between expansions now, it shouldn't be that difficult to keep up, should it?
RoK is in fact being released on Nov 13th. The only major changes with that expansion (not counting content of course) is the addition of the Sarnak and the raising of the level cap to 80. Neithe rof those seem all that world-shattering, but then again... what do I know...
