A development team called Whiskey Jet Simulations is currently working on the implementation of an Airbus A220-300 for FSX. Yesterday more preview screenshots were published on their Facebook page, which already show the cockpit including textures and avionics. Currently the release of the Airliner is only planned for FSX. Whether a version for Prepar3D v4 will be released depends on how successful the FSX release is. More information and screenshots about the project can be found on the Facebook page of the developer team.
More about the Airbus A220-300
Originally, the Airbus A220-300 was developed and marketed as part of the Bombardier C Series by the Canadian transportation concern. However, the development was accompanied by numerous problems, so that the market launch took place much later than expected. Shortly thereafter, in July of this year, Airbus purchased the entire project and has since marketed the Bombardier C-Series as the Airbus A220.