once again for those that don't know about it yet:

Publishing XCSoar for iOS on the AppStore would be illegal!

The rules of the AppStore are not compatible with the open source license and spirit under which XCSoar is developed. Without the option to legally offer the app on the AppStore the potential user base is very small and the work that needs to be done to port it would not be justified in any way. If there are developers that want to do it they are free to do so, but none of the current developers think that it would be a good use of their free time.