Looks like there will be nine new trades of stuff previously untraded, coming out once a month from February onwards. Two Sojourn trades, two Negation trades, two Scion trades and one each for Way of the Rat, Sigil and The Path. Damn, now I'm going to have to hunt around and figure out just what other stuff has been already traded, and which stuff will remain untraded.
Side note - Ron Marz has already mentioned that unfortunately, none of the creators involved will be paid for it, but he still urges people to go out and buy them. Class act.