There is a lot of new feature in MWeb 2.0! Please check out this video: https://www.youtube.com/watch?v=HLfj82JqvXs.
2.0 will update static blog theme, if you has changed the system blog theme, you can find your old theme in below location:
2.0 will update 1.x Library to 2.x, you can find the old Library in below location:
External Mode, Tabs.
LaTex Live Preview, UI for Table Edit/Insert.