The time and effort is put into developing Tiny Core and extensions, not informing you of what they will do next.
They do not plan a date when the next version will be released. It will be released when it is ready.
However, most new versions come out in less than 2 months.
If you install every release candidate, they come out even more often, usually less than 2 weeks. There have been some release candidates I have only run once. When I have run them, the next one is available for download. So I have downloaded and installed it.
Stick around. You will see a continual flow of new versions, with continual improvements.
Tiny Core is being developed faster then most other operating systems.
They would have some idea of what new features will be introduced in the next version, and future versions, but they will need testing. If something doesn't work properly it may be changed. When it is working correctly, you will see a new version.
You won't have to wait long. Probably in a few weeks there will be a new version.
When they release version 3.0 expect greater changes than with other versions.