The first of which will be the Samsung Mandel SGH-i667. We saw the Mandel make a trip through the FCC a few weeks ago, so that seems very likely. This handset is rumored to sport a WVGA display, LTE connectivity, and run Windows Phone Tango.
There isn’t much known about the other two handsets, except that they will supposedly be running Windows Phone Apollo. Based on that, our guess is that these two devices will not see the light of day until late 2012.