Keep in mind that these domain names could just be Blackberry registering them to prevent other people from domain stealing. That, or they could be reserving names for future models they may release. I wouldn't think they'd release another version of the 8300 so soon.
The internet domain "people" do not allow cybersquatting. If you try it, you will get a cease and desist from their legal department (RIM)...ask me how I know.