First details have emerged on an expansion pack for Flight Simulator X that's due out in the autumn.
Called Adrenaline, it's been revealed that the expansion introduces multiplayer air racing, new missions and new aircraft - the P-51 Mustang provided as an example. In addition, it's mentioned that those running Adrenaline on Vista will witness it in DirectX10 - should you have the supporting hardware.
Currently, there's no DX10 support in Flight Sim X but the DirectX 10 update is in production and handily will be released as a free download around the time Adrenaline hits.