After briefly popping up at CES, Sony's PersonalContentStation (aka the "LLS-201") has just been pegged with an April 30th release date in Japan -- that's a good month before it's set to reach the States.
Paid-for expansion packs are also available, and represent a mix of shortcuts to in-game content (a personal space station to store spare ships, rather than part-exchanging them) and further chapters for those who have finished the story missions.