I was just rereading the Winninger quote that started this all, and something occured to me. In addition to the two new settings and the one revisited setting (all three of which he says might not happen), two classic setting products are coming. Everyone has interpreted this to mean that two classic settings wil be revisited, one per product.
But what Winninger actually writes is this: "...there are two more products that revive 'classic' settings in production right now." One of them is by Perkins (almost certainly an adventure path, quite possibly Dragonlance). The other is being headed up by Schneider and Levitch.
Now, I'm not saying this is likely—probably the default assumption is correct and each of these products is for one and only one classic setting—but it's entirely consistent with what he wrote that the Schneider and Levitch product could be for more than one classic setting.