After watching parts of the Deebach Max video again, the following things are still noteworthy:
- As Deebach says, the Max contains most high-quality sounds of the former "Deebach XMS expansion" for Korg arrangers.
- The filters and envelopes are implemented as hardware chips, not just as software (which means it is not just a Medeli with different software).

On the Deebach Facebook page I found the information that the Max now contains over 4,000 sounds (and over 20,000 individual samples - which doesn't mean much unless you know whether this number refers to key banks or total waveforms. Example: One grand piano, e.g. the Roland SRX 11, can contain 700 individual samples, if you count every single sample per key and velocity layer).
Furthermore, several followers remark that the Medeli hardware is a bit shameful and asked about a Deebach MODULE instead of a keyboard. Deebach's answer is that a module IS being discussed with possible hardware manufacturers. That would indeed be interesting.