The Optimus S for Sprint has a product code of LS670. The US Cellular version is US670. There is a phone with the product code VM670 that has been tested here
Global CCF -->Certified Devices
And here
Wi-Fi Alliance: Product Search
And here
The Official Bluetooth SIG Member Website
And ofcourse its been tested by the FCC which the link can be found on the wiki article.
If you are wondering, "what kind of evidence is that?". Well, other LG phones that are on Virgin have "VM" in the product code. This phone IS coming to Virgin. More speculative evidence is when it was asked if it was coming on Virgin's Facebook page, they said that "we haven't released the release date yet, but when we know you will hear it here first". In most cases, they say "no", or "no we don't know of anything". So to say what he said seems to indicate that they have some knowledge of this phonje coming through the pipeline.