According to Engadget the new release date is this coming Monday. iPhoneSimFree already started sending out demo versions of their unlock software. The unlocking will not work until they start running their backend system.
iPhoneSimFree will only ship their solution to resellers and will not enable individual phones for end users.
More details on Endgadget.
Now that the iPhone is just $399 an unlocked iPhone might be selling soon for not much more.