OK I updated the release date on the regular edition. If the Launch Edition is in the DB, you can put something like this into description:
pre-order exclusive from MediaMarkt, Saturn
Usually we do not get to know exactly when different editions get released. It is easier to know for current or relatively current releases, but in general most sites (even retailers and press release) tend to treat different editions as the same. At least in the US what tends to happen is that Launch Editions come out on the game's actual release date, and a regular edition just "appears" some time later without any fanfare. While it is possible that there was some press release somewhere that mentions the non-launch edition, no one seems that embedded in product news for us to have a reliable source. As a result, we are apt to reject a release date on a regular version where a launch edition exists and the date being submitted is the same.