I've heard rumours of everything they've ever made included. I find that very hard to believe. I suspect this will be limited to the Brets and TK stuff, with a "This Week we are doing a limited run of these X products" and they'll cycle them occasionally. Or they'll have a register for interest on a kit, and once it hits a certain number they do a production run.
I approve of making OOP stuff available again, especially if it includes much older stuff, including the specialist games ranges, but I can't see in my head how they can make it viable without a lot of restrictions, or a long waiting time.
If it covers they entire back catalogue, I can only guess that's what will go on sale first: A catalogue.
I'm speculating, but do they have all the old moulds, or will it be limited to CAD designed stuff that can be 3D printed, or just stuff that was in Finecast or metal, though hopefully they make it from FW Resin rather than finecast.
I'm intrigued, but it depends on what will be available, in what material, and what price before I get excited about it.