Well, basicly you can use any firmware available for your Bold - no matter which carrier. However since you got a 9930 of course, your options are rather limited compared to the worldwide used 9900.
Originally Posted by flex22
But back to topic: RIM stated a couple of times that OS7.x support will continue and they might even keep releasing new devices based on this plattform. These devices will most likely be entry level devices like the new Curve 9320 or 9620. As you can already see, core applications like Twitter, App World, Facebook and BBM still get regular updates. Twitter and BBM are even getting rather large ones soon, once the current builds are finished for final release. In terms of firmware releases, the 9900 roughly gets about one new release every month. The other OS7 devices maybe a bit less. As firmware versions are getting higher, some new features are being implemented too, although this still is OS7.1. These features include for example the Application Resource Monitor or the ability to set different colors for your notification LED under profiles.
Support from app developers on the other hand side won't change in a positive way, at least this is my opinion. They'll either turn away from Blackberry completely, or wait till BB10 finally arrives.