The TP2 has one HUGE improvement over the TP, and is the primary reason I will purchase it: a SIM slot.
For someone like me, who has family in other countries, being able to take my own mobile with me wherever I go and just drop a new SIM into it is a massive advantage. If it didn't have the SIM, I'd only upgrade if I got it for free/excessively cheap. But the SIM slot has guaranteed my purchase--especially because once we get an HSPL unlocker, then I can use my phone on other US networks if I need to, which is always a plus.