The Samsung Vibrant is one of the best high-end smartphones currently offered by T-Mobile, and it looks like Samsung will be providing a successor to the Galaxy S smartphone in the form of a 4G device. According to some leaked docs received by TmoNews, the Samsung Vibrant 4G will be compatible with its 4G HSPA+ network reaching theoretical speeds of 21Mbps. In addition, it will feature a front facing camera and come pre-loaded with the Qik video chat application. Now, the original Samsung Vibrant has been stuck on Android 2.1 since launch even though it has been promised to receive Froyo at some point in time. Good news here for T-Mobile enthusiasts as Samsung will launch the Vibrant 4G with Android 2.2 and hopefully will be upgraded to Gingerbread. Otherwise, it is expected to feature the same 16GB of internal memory, 4 inch Super AMOLED display, and a 1GHz single-core processor. Apparently the Samsung Vibrant is the top selling Samsung Galaxy S phone in the United States and has sold around 1 million units, giving Samsung and T-Mobile good reason to launch a 4G successor.