Samsung itself has put out a press release concerning its new i7500, which was announced for O2 Germany. There are a number of specs in there worth looking at, but the most important would seem to be the configuration of the 3G support.
Samsung lists 3G HSDPA/HSUPA connectivity on the 900, 2100, and 1700MHz network bands. That indicates that the device will support T-Mobile USA’s 3G network, though I wouldn’t be shocked to see it available only as a separate version of the device, rather than a tri-band UMTS version that also supported 900 and 2100MHz. The O2 release made no mention of the 1700MHz AWS band.
You can see a copy of the specs from the press release after the jump: