As hard as it is to believe, Microsoft has until now never put out a 3G/4G Surface tablet. But we knew one would come eventually: the company said it was working on an LTE-enabled Surface 2 and indeed, the thing recently surfaced (har) in FCC documents. Now its finally here: Microsoft just announced that the LTE Surface 2 will go on sale tomorrow, and will be compatible on ATTs 4G network here in the US.