If you are talking about the Admin Login Messages dialog, it is not "What's New" ... not sure where you came up name with that as it does not exist in the system.
Any one of the "System Admins" (the support team) or I (the system developer) can post messages that show up for admins--I do post notifications of system updates and new features using that functionality Those messages are slated to show up about once every 24 hrs. However, you can also view them at any time at the bottom of the Administrator Information tab in the Admin Console. (Same information, different access method.)
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