My guess would be that the move would be primarily due to economics in the long run. Since the U.S. dollar has tanked, it would make sense to produce the vehicle here, provided the quality was good (Magna Steyr is renowned as being tops in technology and quality control). I'd hate to see quality go down.

The timing for a move would be perfectly appropriate, as it would be the end of the seven year first gen. X3 run and Magna Steyr's contract would be up.