Wizz are to start flights (due to the delivery of a new A320 to Gdansk?) the same week to Dortmund from Gdansk so I presume that the airline is entirely responsible for the schedules for both of the new routes.
The arrival time of midnight for a scheduled flight is not out of the ordinary. You only have to look at the arrivals board at any airport to see there are many, particularly in the summer months.
Also, what Transat service?