I’m really sorry it took me so long to respond 
We shared all the planned changes happening across DC products in their next major releases. If we will have more to share, we will definitely do it.
Please remember, that products may introduce additional changes. The best way is to observe product specific announcements. A good example may be recent Confluence announcement Preparing for Confluence 10.0 | Confluence Data Center 9.3 | Atlassian Documentation followed by discussion Confluence 10.0 release EAP is available now