List for upcoming releases

I want to make a list for upcoming releases. So i tried to query the "games" with filters for expected_release_month/year. Due to the fact that the expected_release_* filters will work if original_release_date is not set only, the result contains much more then expected. Now i need to find out if the original_release_date is set or not. Im happy about others ideas too :-) Primary interest is upcoming releases only (for the moment).