I am also just a customer, but I asked myself the same question and clarified what I was told:
I was at Digitec on Friday and was told that the delivery had not arrived and that the next one would probably come in mid-August.
But since Xiaomi itself apparently already delivers and sells the device for 1'399.- (with 5 years warranty instead of the 2 years at Digitec) and Digitec itself now also offers a deal via the Xiaomi Mi Flagship Store, I used Saturday and went to Wallisellen.
When I arrived at the Xiaomi Mi Flagship Store, I immediately received an email from Digitec saying that the device had now been sent...
I then asked about it. Apparently Xiaomi first uses the devices for themselves and only when they have them in stock do they pass them on to other dealers. So if yours hasn't been shipped yet and you don't want to wait until mid-August (if the delivery comes at all), I would recommend ordering directly from Xiaomi. It would be about 140.- more expensive, but it will arrive much faster and you will have 3 years more warranty.