Announced on the prepar3D site is the news of version 4 a 64 bit platform to be released on the 30 May 2017. Here is what they had to say and we quote :
Lockheed Martin is proud to announce that the next generation of simulation and training will start on May 30, 2017 with the public release of Prepar3D v4. The release culminates over eight years of Lockheed Martin development and welcomes major enhancements and new capabilities.
Prepar3D v4 completely changes the simulation landscape with a comprehensive baseline update to a 64-bit architecture. Higher resolution visuals, more objects, increased data precision, larger scenarios, and improved performance are now all possible at levels never seen before in the product’s history. The sky’s not the limit!
Additionally, the release brings dynamic lighting, rain/snow particles, global 3D trees, a fully reworked software development kit (SDK), new default vehicles, and countless improvements.
More details will be released over the next week with Prepar3D v4 being directly available from Prepar3D.com on May 30, 2017 at 2:00pm EST.
Source : P3D Site Press Release