They are not. I have been reading the comments on Instagram and TXI has confirmed that they are not limited. They are just like the Red and Blue, only "Special" because they are black and white.
Now, I have a question for TXI. Why are they not part of the Variety Box. If they were limited, I could see that. But since they are not limited, this makes no sense to me. I don't see most people going out and buying a brick of a unlimited edition deck unless they really like it, and since they are unlimited, you will eventually make them available on the variety box.
So, why delay? If a customer wants to buy 4-6 decks, 2-3 of each color, that is 4-6 toward a brick. Maybe I could top up several other decks to get to a full brick. This way, I only buy4-6, as a customer, I would have just purchased 12.
Plus there is this whole hey, I purchased on day 1, why prevent me from adding it to a brick???