A suggestion for the roadmap can be found in this branch:

https://github.com/danbev/beta.aerogear.org/tree/data-sync-rebirth-roadmap

If you don't feel like building it yourself you can try this OpenShift instance:

Please note that the dates are just made up and something that we need help from each client library project to provide feedback on what is reasonable. 

Let us know what you think and from the feedback given, either here or as PRs, we will try to break this down further and start creating JIRAs to link to the roadmap.