There's numerous references to FCC filing for GNote with HSPA+ radios for AT&T. They are dated around late September. None mention LTE. It should be noted this filing is for a version that is already shipping in Europe and elsewhere. So it's not hard for Samsung to file at FCC. More on this later.*
But there is some indication the AT&T version will
also include an LTE radio so that it works on any of their network protocols.
Samsung Galaxy Note to Come with 4G LTE, on AT&T?
Samsung Galaxy Note to Come with 4G LTE, on AT&T? - Carrypad | Carrypad
It basically says a senior vice president let it slip that the US version will have both HSPA+ and LTE.
I'm not totally sure just how an FCC filing works in what sort of timeframe. However, I'm inclined to believe if that was the case, specs in the FCC filing for AT&T would have indicated it to be so. Thus I am not optimistic about that Carrypad's interpretation the AT&T version will have both LTE and HSPA+.
An alternative explanation, one that is still consistent with the quote from the senior vice president, is that they are planning 2 distinct versions, one for Verizon's LTE/CDMA network and another version for ATT's HSPA+ network (the one already filed with FCC) but not
their LTE network. As yet however, there is no FCC filing for the Galaxy Note for Verizon's frequencies. The LTE frequencies used on Verizon and AT&T differ.
* On the other hand, because the FCC filing in September is for the currently shipping model, we may yet see a version for AT&T LTE/HSPA+. It's just that Samsung isn't ready to file that one at FCC yet.