Updated on the play store, and available for download[1] as well. Getting it from the play store is the preferred method since you will automatically get updates. Instructions on how to opt in to the alpha available at http://lists.wikimedia.org/pipermail/mobile-l/2014-March/006642.html

New changes in this release: - Plenty of crash fixes - My Contributions screen is hidden. This was incomplete and not being worked on atm, so hidden till it can get more love. Patches welcome. - Minor design fixes.

[1]: https://releases.wikimedia.org/mobile/android/wikipedia/alphas/wikipedia-2.0...