As of revision 64614 on v4.0, there is a new area where you can choose who is emailed when the updates to your system are scheduled.
To set who should receive the notification for the scheduled updates, follow these steps.
Under Admin, click Admin.
Click Notification Settings.
Ensure Notifications Enabled is ticked.
Click the Recipients tab.
Click Add Groups & People.
Select the groups that should receive the email, then click Continue.
Select any specific users if applicable, then click Continue.
The selected groups/employees will now be notified of the date by which your test and live systems will be updated.