To begin things, the phone will only work in large towns like New York, Los Angeles, and Miami, where T-Mobile has it's larger, faster wireless data network, as the phone won't work on the older, slower networks. The data plan for the phone is $25, which makes it less expensive than most data plans out there.
The Android software makes it's debut on this phone, which will be a major selling point as this phone makes its debut, which should open up many more possibilities and enhancement for users. This should bring the iPhone some major competition, and hopefully bring prices down and users can enjoy the battle between Google and Apple, and whichever other companies decide to join in.