Title says it all. The Windows Phone Blog has just posted that the Focus (v1.4 only) is getting NoDo + Security fix as an update (7390 + 7392). So go and plug your phone into your computer now and head to Settings and "check for update" to get it sent on over to your phone.
No word on when the v1.3 Focus will get he 7392 "Security update".
As a side note, they go on to explain why occasionally you may a specific update for your phone, unrelated to the OS (the Focus for Mango has one recently)--these are basically fixes and improvements for your phone's hardware. They're nothing new, per se, as Roger's rolled one out, the Mozart has received one, etc.
"A few months back I explained that you may occasionally receive a notification of a hardware-specific update for your particular Windows Phone. These updates improve things like battery life, call clarity and touch responsiveness - to name a few examples. These updates are designed to make specific improvements. Not every phone around the world needs the same package of improvements. In some cases no update at all is needed. I wanted to remind you of this because some of you will start to see these types of updates soon, and I wanted you to have a little insight into what is included. It’s all part of keeping your Windows Phone in tip-top shape."
Sounds good to us and it sounds like some "updates" are on their way soon. (Thanks, Bryce and our forums admin Dave Blake, for the heads up)