I'm pretty sure that it's going to be released earlier, maybe in November. Amazon.de usually states 31. December of the year of the planned release if they don't have the exact date yet.

It you want to get the German edition, but are unsire about the language: I think it's save to say they will have an English sound as well. DVDs and BluRays that are released in Germany almost always have German sound and the one the film was originally made in. I always watch British and American films in English .