Marvellous what you find on the internet when you are looking for something else...like a book by yourself (and your translator!) I have no idea who the cover artist is, but the translator is Susanne Gerold and the publisher is Blanvalet. It is due for publication in September.
And for those who don't speak German, from the cover,
what's the book?
The literal translation is "The Federation of Illusionists" -- Whispering Sand