New player controllable aircraft or vehicles aren’t ready yet, but we have decided to release the update 4.504 that improves many aspects of the sim. The main feature of this update is the increased visual detail of the landscape at close distances, which is a graphics option. It makes the terrain bumps and unevenness, that were previously only calculated in physics, to be visible. Overall, this improvement makes the vehicle and aircraft movement on the ground look much better and natural.
More detailed information you’ll find on the Official IL-2 BOS site …