I believe it would mean a slightly redesigned iPhone, but feel free to call me crazy. Well, not redesigned, but with a changed frequency chip. According to what I'm reading, T-Mobile/Wind uses 1700/2100, but the iPhone 4 only has support for 2100, which is new, but not 1700. This is off of my relatively uninformed understanding, however.
Can't find the article now but I do believe I read that the current iPhone 4 isn't fully compatible with T-Mobile/Wind, that it can only use an Edge network. Does Wind have an Edge network?
i7 iMac / iPad 32GB WiFi + 3G / iPhone 4 (Black 32GB) / iPod nano (4GB Black 1G)
"What we call the beginning is often the end. And to make an end is to make a beginning. The end is where we start from." - T. S. Eliot