The Canadian competition regulator intervened in the FTC v. Microsoft hearing earlier today, filing a letter to Judge Corley warning that it had:

concluded that the proposed merger is likely to result in a substantial prevention and / or lessening of competition with respect to gaming consoles and multigame subscription services (as well as cloud gaming)

Microsoft has now responded, making it clear the formal period for Canada’s regulator to prevent the deal from closing has already passed:

We received notice from the Canada Competition Bureau that it would continue to monitor our acquisition of Activision Blizzard after the formal waiting period preventing the deal to close expired. We continue to work with regulators around the world to address any remaining concerns - Microsoft spokesperson Rebecca Dougherty