I was at my LHS today (Mainline Hobby) and saw these sets are coming in. I ordered mine through Mr Muffins because of a different reason, and I don't believe he got them in yet.
I see there's a seller on ebay who has broken up the set, so you can buy 520 separately. It is a pre-war version of 520.
Anyways, for anyone who has ordered one or received theirs already, feel free to post any pictures or your thoughts.