This is one of those things I didn't see coming, but which makes perfect sense. Festool's engineers have exploited the mortise-cutting capabilities of the Domino (specifically, the big-boy XL) by creating knockdown fasteners that can be inserted the same way as loose tenons.
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Here's the demo they were giving at Holz-Handwerk:
The connectors, which come in both flat and corner varieties, look to be a boon to Domino-equipped shops that want to ship flatpack and/or need to create reusable structures that can be broken down again (exhibit designs, for instance). As for why they've only created these for the XL, it's because you won't be joining 3/4" stock with Domino Connectors; they're only designed for use in 30mm (1.18") stock and up.
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The Domino Connectors are available this month in Europe. Those of us in North America will, as always, have to wait a bit longer.