Links to changes to recent 2.x versions (from the beta forum):
2.1.1 - vague but benefit is given
2.1.0,
2.0.5,
2.0
The descriptions of changes can get technical but knowing what to look for in the updates is helpful. If there is a changelog in one file that goes back to the 1.x versions I would enjoy a look at it to see how far things have come along.