Default Anyone know what this security update is Samsung is trying to push?

I keep canceling it. Trying the link for more info and the page is 404.
Edit: Sorry no screen shot. I didn't think to grab one. Just look at the date of this post. Are you seeing similar behavior? I just don't want to blindly let something install without knowing what is going on. I also don't want to Bork something by letting the phone do stuff automatically. It could "fix" something I don't want to be fixed and block something I don't want blocked. Knowing Samsung, it would fix something that cannot be rolled back once applied.
Edit 2: Just did a twrp nandroid backup, just in case. I don't know if the update does anything to hardware yet, but I have the software side backed up.