The touch-pro 2 has some hardware improvements, but none concerning it's speed. The software that's delivered by HTC is further optimized and is a lot faster. Also the version of the processor that's included has changed in the TD2 & TP2. This probably means that the processor has been more optimized too.
I expect the TP2 to be faster in use, because of the new well working software (Shell). Next to that, it will be easier to work with because of the bigger screen.
About the keyboard, looking at some video's about pre-releases of the phone, every reviewer says the keyboard is one of the best ever. I haven't seen any lag when people were typing.
I think normal all-day use (agenda, mail, phone, sms, etc) will be faster and more accessible. But gaming, or other 3th party software that requires a lot of horsepower,....... Just don't expect the TP2 to be a lot better/faster. But then again, htc targets the bussines world.
I suggest you look into other topics and look for reviews (youtube: touch-pro2 review), so you can see for yourself.
I'm upgrading from my Hermes
. The reason why I won't wait for other 1 gigz phones? Playing 3d games, just won't work on phones cause of the louzy controls and little screen. Other than that, I can't think of reasons why I would want a 1 Gighz phone. Battery will be empty faster and it will take a year before the new processors will be fully optimized. (not to think of the heat the new processors will make)