2017 - Nothing is known at this point in time...
2018 - Holiday Indoor - Confirmed - (7/27/17) BlooLoop reports that the Plopsa Group will invest €7.5 million into the building of a new indoor facility at Holiday Park in Germany. According to the report it will be a 5,000 square meter covered area to be called Holiday Indoor, and it will be ready to open by Summer 2018. The new indoor attraction area will feature seven new attractions and help turn Holiday Park into a year-round / all-weather destination. The list of attractions will include a family coaster, interactive flying carousel, slide, ball pool, climbing tree, playground and more. Follow the link to see some of the concept artwork for Holiday Indoor.