I thought I'd start a new thread on this since I don't see one anywhere.
This is using the "Official" beta downloaded directly from Microsoft, not the leaked version.
So with that said I'll start off with the first problem I've encountered using it.
It is with the Update function failing when trying to download the update.
With error code: X080240022 (Screenshot)
If this happens to you like it has to me 3 times so far the fix is just restart your computer then update Microsoft Security Essentials & all is fixed & fine.