Update 2.11 Roadmap to include dates and planned work (ansible#72222)

* Update 2.11 Roadmap to include dates and planned work

* remove comma

docs/docsite/rst/roadmap/ROADMAP_2_11.rst

@@ -18,19 +18,30 @@ PRs must be raised well in advance of the dates below to have a chance of being
 .. note:: There is no Alpha phase in 2.11.
 .. note:: Dates subject to change.
 
-- ????-??-?? Beta 1 **Feature freeze**
+- 2021-02-12 Feature Freeze
   No new functionality (including modules/plugins) to any code
 
-- ????-??-?? Release Candidate 1
+- 2021-03-02 Beta 1
+- ????-??-?? Beta 2
+
+- 2021-03-29 Release Candidate 1
 - ????-??-?? Release Candidate 2
-- ????-??-?? Release Candidate 3
-- ????-??-?? Release Candidate 4
-- ????-??-?? Release
+
+- 2021-04-26 Release
 
 Release Manager
 ---------------
 
- TBD
+ Ansible Core Team
 
 Planned work
 ============
+
+- Improve UX of ``ansible-galaxy collection`` CLI, specifically as it relates to install and upgrade.
+- Add new Role Argument Spec feature that will allow a role to define an argument spec to be used in
+  validating variables used by the role.
+- Bump the minimum Python version requirement for the controller to Python 3.8. There will be no breaking changes
+  to this release, however ``ansible-base`` will only be packaged for Python 3.8+. ``ansible-base==2.12`` will include
+  breaking changes requiring at least Python 3.8.
+- Introduce split-controller testing in ``ansible-test`` to separate dependencies for the controller from
+  dependencies on the target.