Mojang has become the latest Android developer to jump on the beta bandwagon. Today sees them introducing a beta program for Minecraft PE for Android. To join, you simply need to apply to the Minecraft PE Test Group (Google+) and follow the instructions. While it’s open to anyone, Mojang indicates they may do some limitation down the road. Note that your app will still be updated with the final version of Minecraft Pocket Edition; you can quit the beta anytime.
While playing a beta release, it will not be compatible with current version of Pocket Edition. If you go from a beta version back to a final version, the world may be corrupted. Beta version worlds will always work with the final release.
The 0.8 version is expected by the end of December.