The latest DEVELOPMENT.md [1] documents using the gradle based tooling. It also contains general information on the switchover and a timeline of significant events related to it, such as when the 3rd party jars will be removed from the Edgent repository and the ant based tooling will no longer function.
[1] https://github.com/apache/incubator-edgent/blob/master/DEVELOPMENT.md <https://github.com/apache/incubator-edgent/blob/master/DEVELOPMENT.md> — Dale
