There are lots of changes in 2.0, but they might not be obvious.
Ulrich's intention is to generate an accurate model of Bill's system as he states it in his book and the way it is implemented in Investor's Dream.
For example, in Ulrich's first model he used a very simple formula for defining a fractal. Now, this formula was actually pretty accurate, but it would not find all fractals. The new formula will.
The original model would also use fractals older than the most recent one. It was decided that this was not accurate and was changed.
Another change is in the Balance lines. While these are still not exactly equal to Bill's they are a closer approximation.
There were other changes as well.
So, once everyone agrees that the system is equal to Bill's then we can begin to test it. I for one would not consider either trading Bill's system or taking Bill's course if I did not believe that the system has the potential of being profitable.