The app doesn't announce each new version unless you have add-ons that are incompatible with the new version (in which case you get a dialog telling you so), last I checked.
It does tell you that it's applying an update when you do the update startup, so far. That's likely to go away as well.
I hate being told that Firefox 5.0 or 6.0 is out, only to find out that there are barely any major changes in this seemingly major version. If you want to release more often and make it a more seemless process, the app should stop announcing each new version like a major release.