All,
This is very interesting, let's walk through a couple possible implications. Let's take PuckmanFL's desired trade, a 3BR in Kauai Lagoons.
Marriott has the desired week sitting in its Trust inventory. Puckman will put in a trade request -- it's a practical impossibility that week will be available to Puck on July 26th, unless it is Marriott's Trust that provides the needed week. Otherwise, Puckman will sit there waiting for some Kauai Lagoons owner to 1) enroll and 2) redeem their 3BR for the exact week Puck wants. That's just not going to happen. I bet Marriott makes the trade because otherwise they eat the KL week and they are awash in KL weeks.
Where the rubber will hit the road is for a sold-out property -- take Frenchman's Cove, where there may be modest inventory in the Trust, and Puck decides he wants to go there in 2012 and redeems his week for (skimmed) points and requests a MFC trade.
If there are few MFC weeks in the Trust and Puck is offering Ko Olina where the Trust is awash in weeks, I can easily see Marriott not making its precious MFC week available to Puck, and requiring that Puck wait until another enrolled owner redeems their MFC week for (skimmed) points, to match Puck. Trade Power of the relative weeks, combined with scarcity of inventory in the Trust, means Puck has to wait for another enrolled/skimmed owner.
All they did, in the second example, was move the exchange marketplace from II to their internal system, but did not supplement the internal system with their own weeks. I would assume that the trade chances are no better than from II.
Interesting stuff and I'm sure there is much we will still learn about this.
Best to all,
Greg