Tool storage is big business, You can be like DeWALT/Milwaukee and make your own storage solutions or you can be like Bosch/Festool and re-market an existing brand. Metabo did the latter and followed in Festools footsteps by hooking up with Systainer.
It is called Metabo Metaloc and comes in a few varieties. Not much is know about the system yet as we have seen an official USA press release. The system looks like it can clamp to a Metabo dust collection unit and like Festool has a guide in the lid for tool placement. We will keep you posted as more info trickles in. The system is currently available only in the UK.