There's naturally been a ton of feedback in the past few hours on AT&T's new data pricing strategy, and the company has been responding to comments all morning over on its Facebook page; one of the key tidbits that's come out of the discussion so far is that folks on the current $30 smartphone data plan will be able to keep that plan when upgrading hardware. Translation: yes, you'll be able to get a new iPhone without switching to the $25 / 2GB DataPro plan if you so choose. What you won't be able to do, though, is keep the $30 plan and add on the $20 tethering option -- tethering specifically requires DataPro, so your hopes and dreams of a so