[2300] Core Homeworld background?


Project Bayern has led to me opening up my copy of the core boxed set for the first time in ages, and one of the things I noticed was a note that the Core worlds background would be coming in a later book. Has it appeared at all yet, and if so, which book? I have a hardcopy, so if it has since appeared in an updated pdf I won't be able to get it.
Dear Matt,

I am in the same boat as Lemming here. I have a physical copy of the 2300AD boxed set. How can I get you proof of purchase, so as to have access to the .pdf? Is there an e-mail I can use, and if so, what is it?