Have to wait and see what exactly it means here. Basically the implication is that there will be some special pricing/deal for folks that buy XF licenses as soon as they are available. What the deal is, and how long it will be offered for is something we're just going to have to wait to find out.
:: sets up virtual tent in front of the not yet revealed XF storefront ::
Yes many people buy used licenses just to save a buck. Especially the 4.0 publishing suite license is worth it considering no expiration at all. Just reup in another year or 2 or 3 for access to the next major upgrade.