Speaking of 2nd generation hardware, another Samsung device running Windows Phone "Mango" seems to be in development (see earlier Galaxy SII rumor). Found via the Samsung UA profile (looking at the HTML code) we can see the device name "GT-i8350" and that it's running Internet Explorer 9.0 which of course means "Mango".
Other devices specs are slim: 800x480 WVGA screen (AMOLED, no doubt).
So, what exactly are we looking at there? NanaPho seems to think it's the follow up to the Omnia 7, which makes sense, but being details are so vague, no one really knows at this point. But it should come as no surprise that Samsung has other devices in the works.
Still unknown, however, is the Samsung GT-i8703, which sounds like a CDMA-variant of the Omnia 7.