So we know that T-Mobile is planning to launch an HSPA+-capable smartphone sometime this summer. However, our knowledge of the device ends there. Thanks to a new page on the T-Mobile site, though, we can learn about the mystery phone as soon as the T-Mo releases the information about it. The page, which can be seen here, offers users the ability to sign up to be sent information about the HSPA+ phone and contains a white placeholder image, as well. There's no way of knowing if the actual phone will resemble the white rectangle seen on the page, but if it does, the device looks like it will be similar to the HTC EVO or Moto DROID X, featuring a large screen and no physical keyboard.
I wouldn't be surprised to see T-Mobile launch an EVO-like device when they announce the HSPA+ phone. The carrier doesn't have an Android device with a 4.3-inch display, which seems to be the cool thing to have nowadays. What better way to blow out the launch of a gigantic Android phone than by making it the first HSPA+ phone, similar to how the EVO was Sprint's first WiMAX device? One last thing to note is that while we've heard in the past that T-Mo's HSPA+ device would be launching this summer, the site says that the handset will be launching in the even vaguer time frame of "later this year."
UPDATE: After digging through the site's source code, some eagle-eyed users have spotted the name "Vanguard," also known as the HTC Vision/G1 Blaze. Nothing is official, but I'm cautiously optimistic that the Vanguard/Vision/G1 Blaze will indeed be T-Mobile's first HSPA+ device.