Windows Defender Hub released by Microsoft
The Windows Defender Hub is basically an information hub with links to up-to-date security info and blog posts. It does include an 'Open Windows Defender' button, which could be helpful for the less advanced user who might not know how to run Defender. The hub also includes a Tip of the day.
I look forward to Microsoft updating the UI of Windows Defender itself, to bring it inline with this Windows Defender Hub, and more so the rest of Windows 10's styling.