Microsoft recently published a roadmap for the office 365 environment.
You can look at it here.
It shows what has already been rolled out, what is currently in the rolling out phase and what is intended to be implemented/changed in the next weeks/months.
New features are not released for all office 365 at the same time.
Rather the new functionality is rolled out in several phases, during a few days up to a few months, depending on the impact of the changes.