Certainly the specs of the LG Isai FL would seem to resemble some of what we expect for the LG G3. The former features a 5.5 inch screen with resolution of 1440 x 2560. A quad-core Snapdragon 801 MSM8975-AC is under the hood with 2GB of RAM inside. Back and front snappers come in at 13.2MP and 1.2MP respectively. It is all powered by a 3000mAh cell with Android 4.4.2 pre-installed. The device features WiMAX 2 + LTE-A connectivity, and includes LG's Knock Code and a new UI called Isai Motion. The phone also will survive a submersion in up to 3.2 feet of water for as long as 30 minutes. LG worked with Japanese carrier KDDI on the device, which means it probably will be exclusive to the mobile operator, like the original Isai was.
Some of the specs match what we are expecting for the LG G3, such as the size and resolution of the screen. The battery size and water proofing also could match what we will see on the new flagship model. But the LG G3 should come with 3GB of RAM along with a 16MP rear-facing camera and a 2.1MP front-facing camera. In addition, there are some differences in the design of both the LG G3 and the LG Isai FL, which you can see from the pictures below, showing the rear volume controls on the Isai FL.
While many have been thinking that the LG Isai FL is a Japanese version of the LG G3, apparently this is not the case. And the fact that LG is making a point of having this known, could mean that the Korean manufacturer has some very exciting specs and features to show off for the LG G3.
The LG Isai FL is not a Japanese version of the LG G3 according to the manufacturer
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source: ZDNet (translated) via GforGames