My guess would be that's a hole that's been left for the carriers to insert their own branded app (and customized to the unique aspects of their particular voic

My guess would be that's a hole that's been left for the carriers to insert their own branded app (and customized to the unique aspects of their particular voicemail platform). Remember the 'base' Ice Cream Sandwich you see on the Google Nexus phones will be combined with carrier specific apps before Sprint, Verizon et al role out a build to their phones.