According to a document send by our tipster, The mysterious LG-F460L is indeed a LG G3 variant.
As you can see from above image, the new LG G3 (F460) handset has three model numbers: LG F460S, LG F460K, and LG F460L, each corresponding to South Korea’s three mobile carriers (SK, KT, and LG U+).
LG official announced that the LG G3 will be offered in five vibrant colors: Metallic Black, Silk White, Shine Gold, Moon Violet and Burgundy Red. As you can from below image, the New F460L model also named as LG G3, and will be available in Metallic Black(TN), Silk White(WH) and Shine Gold (KG).
The New LG G3 F460 model will come with snapdragon 805 processor, It will be available only South Korea Market.
The document also list the device with model number “US990”. The “US” prefix in the model number suggest that it is the U.S. Celluar version G3. It will be available in two color option: Metallic Black(TN) and Silk White(WH).
Sprint will be the only wireless carrier to offer the U.S. variant of LG G3 in a Shine Gold color.
So far, we do not know which U.S. carrier will offer the 16GB version with 2GB of RAM and which will carry the 32GB version with 3GB of RAM.
[Update] T-Mobile has confirmed that they will carry the 32GB and 3GB RAM model.