Tim,
The update/upgrade path is as follows:
1. The Saab v1.3 is the current production version available in the store,
1. There will be a v1.4 update for XP10 (only), which will include most of the bug fixes and some enhancements discussed in these forums.
2. There will be a v1.5 update for XP11 (only) which will be the same as v1.4 and simply allow the aircraft to load and run in XP11. This will NOT include new textures to take advantage of the new XP11 lighting. In addition, Austin has made some significant changes to the flight model (especially turboprops) and we will NOT be adjusting for those changes with this version of the Saab. So, although the aircraft will load and run without crashes, the engine and flight performance may not be exactly as it was in XP10.
3. There will be a v2.0 for XP11 (only). This will, in essence, be a whole new aircraft. It will include all new 3D modeling, texturing, and coding. We will be adding additional system modeling and other new features.
I hope this provides a clear understanding of the upgrade path.