We just posted 6.0.0-SNAPSHOT to sonatype.
The issues that are scheduled to be fixed in 6.0.0 are rapidly decreasing and a new release will happen soon.
We are interested in feedback in ease of upgrades, any specific challenges you've ran into, performance issues, etc. The change set is huge this time around.
If you want to try out the new version with your app, you have two options
1) use the published snapshot
Then build your app and test.
2) build it yourself
Then in your app, add