The non-smart ass answer is that HSPDA+ is only being tested in 3 US cities right now (St. Louis and two others) and has yet to be officially released. Because of this, they are still only using the 3G icon for both standard 3G networks and the 3G+ networks. I would assume/hope that when AT&T goes public with their rollouts of the new infrastructure--we will get a simple update (much like the one that will enable MMS) that shows us 'E', '3G', '3GS'.