Hi wiqvist,
Definitely, when you update a software, you update it, not only parts of it.
If you use a software version 1.1, then you update it to version 1.2, you can't have parts in 1.1, parts in 1.2 .... that would be a total non-sense.
It would not be possible to support software, where people would have only parts of updates, you would then have dozens of versions in parallel ... It's simply not conceivable.
About the specific point of radio chatter, I suppose it'll be like in SS 2008, where you can separately set the sound volume for it, before starting play.