any new updates with this firmware upgrade?

As far as I can tell from searching, nein!

more on firmware upgrade...
 

I spoke with the Sony repair facility in Teaneck, N.J. and they said that the West Coast Sony repair facility in LA (where I live) can also handle the firmware upgrade. I will be calling the LA office tomorrow to confirm this...as it would obviously save me from shipping the NX5U from coast to coast. They also confirmed that this firmware addresses only the buffer overrun situation...so it's a fix just for that with no other enhancements.

I'll report back on what the LA facility tells me. I would like to see if I could make an appointment to bring it in and pick back up same day, but I'm pretty sure that's not how they would want to work it. It'll probably be drop it off, we'll get to it when we can, etc.

I'll share more on what I learn in the next day or two...

John