EnhanceSecurityMode details

Hello,

Can anybody point me to a resource that has details about the new EnhanceSecurityMode policy? It is not clear from the policy documentation what this actually does:

Enhance the security state in Microsoft Edge

Microsoft Edge Browser Policy Documentation | Microsoft Docs

I searched this forum and elsewhere for information, but I can only find the release notes, the policy documentation, and news articles that point to these original sources. 

Is this mode a rebranding of the 'super duper secure mode' announced last year that disables JIT? 

Thanks!

Andrew