The key goal of the Jakarta EE 9 Release Plan is to move from the javax namespace to the jakarta namespace.
Almost all of the Jakarta EE 9 components will be exclusively focused on that effort.
But, there are a few components (ie. EJB, Activation, maybe others..) that need additional changes to their APIs in the Jakarta EE 9 timeframe.
For these components, a separate Release Plan will be necessary to outline the reasoning for these additional updates.
Also, it is expected that these type of changes will still be required to stick to the date goals being set for Jakarta EE 9.
These component release plans are not as elaborate as the Jakarta EE 9 Release Plan.
They should reference this overall Release Plan as a basis for the individual component release plan.
These component release plans will utilize the existing Eclipse mechanism for defining an upcoming release, which is documented in the Eclipse Foundation Project Handbook.