Although you'd think AT&T would be all over the Verizon iPhone's new personal hotspot feature if only just to keep feature parity with its biggest competitor, the carrier is taking a more measured approach -- an AT&T spokesperson just told us that they're "evaluating the feature, but have no plans to announce at this time." Given that the iOS 4.3 beta just brought hotspot support to the GSM iPhone, we're guessing that the holdup is more tactical than tec