In essence, there are two regimes. One is proposed under the CSE act, and another one already exists under the PSEA, the broader Public Service Employment Act. Mobility provisions of federal civil servants are, and should be, governed by that latter piece of legislation, so this seeks to remove the duplicative CSE provisions. The substantive rights of each employee, therefore, are completely unchanged.
On April 23rd, 2018. See this statement in context.