During my talk on EventBus 3 at droidcon Berlin, I announced the availability of EventBus 3 beta on Maven central. To use the new annotation based API, use the following dependency in your Gradle script:

compile 'de.greenrobot:eventbus:3.0.0-beta1'

And if you want to make things real fast, include the optional annotation processing in your app project (not suited for library projects):

provided 'de.greenrobot:eventbus-annotation-processor:3.0.0-beta1'

The annotation processing during build time speeds up the 1st time registration of subscriber classes by building an index. The graph shows the resulting speed in registrations per second (higher is better). Compared to EventBus 2.4, it is three to six times faster.

More details are available in the EventBus 3 slides (PDF download).