“The WordPress navigation has confounded even sophisticated users. With the new design, weâ€™ve cut the number of navigation options in half, separating the primary functions (writing, managing posts and pages, editing the blogâ€™s design, and managing comments) from secondary functions. This presents information at a more comfortable pace, revealing only the information thatâ€™s necessary.”
From what I can see Jeffrey Zeldman and crew have done a fantastic job at cleaning up the clunky interface; one of my major beefs with it. Keep in mind that it is only release candidate one.