2.0 is really intended to add support for the 4 cylinder platforms, mainly the ECOtec and the 2.2 or one those 4 cylinders. Its actually out in beta, on cars, but really the main thing they can expand upon is the 2 bar/3 bar map coding.
1.6 and 1.7 fixed alot of labeling issues, as well as added IAC and other tables for the LS crowd.