Hey everyone!
So the commits dropped because the majority of the work was on a different branch as ankushagg93 stated. 
We merged that branch into master a few days ago and we think it is in a pretty good place as of today! There have been several changes to the build process, we’ve updated to Angular 2 final, and there are a few breaking changes to the components. These will all be outlined for you in the changelog.
We have the tabs starter building and running using the following branches:
https://github.com/driftyco/ionic2-app-base/tree/beta.12
https://github.com/driftyco/ionic2-starter-tabs/tree/beta.12
We’re internally testing these to make sure everything is working smoothly! When our testing and any updates are complete we’ll be releasing beta 12. (We’re hoping sometime next week) 