According to pictures on the tfw2005 site, the Minicons from the 12-pack look to be released as single packed Minicons soon. They would have to be very small packs, and would only be a few dollars each.
http://www.tfw2005.com/transformers-...-packs-166330/

They look to be exactly the same, and the 12-pack would have to be better value, but the single packed figures would be for the kids or parents who want a really cheap toy/present. And any collector who doesn't want all 12, but just one or two that they really like.