Does this mean there will be two branches? which one should we use (for future)?
A year ago it was like this:
1.X - STABLE
2.X - TESTING
Now, it is like this:
2.0.X - STABLE
2.1.X - TESTING
To answer your question, 2.1.X will become the new latest and greatest version of UrBackup; however, until you see it posted up on www.urbackup.org, as the major client and server download, then it is not considered STABLE.
Meaning to stick with 2.0.X versions if you want to know that everything will work 99% of the time, or go with 2.1.X and assist with the Beta Testing.