[Curved screen... please no!]

I like the curved screen. It makes the device a lot less bulkier and it looks nicer overall. The only downside will be finding a screen protector.

[Protective Case Suggestions and Ideas]

Since the phone already is 14mm thick, a slim silicone case might be the only way. A flip case would add a lot of bulk. Wouldn't be a deal breaker though.

I would make the case definitely some sort of semi-transparent colour or matt black.

[Design the QWERTZ layout]

I use the Swiss layout which is quite similar to QWERTZ.

I think EskeRahn's solution might be the perfect compromise for all German speaking and Scandinavian people.

And if it could get shipped on the same date like the QWERTY version would be perfect.

[Curved screen... please no!]

I don't really care if the screen is curved or not.

The curved screen might actually help that the top row on the keyboard is less cramped.

[Design the QWERTZ layout]

Can you write umlauts ("ö", "ä" and "ü") easily on the qwerty layout? And the same with "é", "à" and "è".