It takes more than a chip to enable 4G connectivity
Ever since a recent iFixit teardown revealed the presence of a Qualcomm WTR1605L 4G LTE-capable radio chip in the Nexus 4, there's been a lot of speculation as to what it might mean. Conventional wisdom suggests that LG wouldn't just include extraneous silicon in the device unless it was planning to use it for something.
That's led some to believe that the current Nexus 4, a device advertised with HSPA+ connectivity, might actually be hiding LTE support to be unlocked in a future software update. Or maybe it could be possible to root the Nexus 4 and, you know, use mad hacking skills or something to unlock LTE on the device.