The wait for the Sony Xperia Ion in the US has been a long one, but that summer release feels considerably closer now that the Android flagship has swung by the FCC. As we'd hope, the Ion is passing through in full AT&T regalia, carrying the 700MHz and 1,700MHz 4G LTE bands it needs to run on Big Blue -- albeit with a legacy Sony Ericsson label. Along with the expected 850MHz and 1,900MHz HSPA 3G frequencies, we're also seeing an odd instance of 1,700MHz 3G that would normally be reserved for T-Mobile. Given that there isn't matching 2,100MHz support, we're more inclined to see the 1,700MHz block as related to AT&T spectrum refarming or other, more practical purposes than as a ghost of attempted mergers past. An FCC approval still doesn't provide any direct clues as to the release date, although removing that one major hurdle gives AT&T the option of launching sooner in the summer rather than later.