That's something that's always bugged me slightly, but I think I know how they'll use it - doubling the lines in either direction. It'll simply double the Horizontal resolution of the picture by duplicating each pixel to the left. For vertical, since the lines will swap between even/odd anyway for 3D effects, that'll automatically generate a line doubling effect (duplicating each pixel downward) if the refresh rate for 3D is high enough (I'd shoot for 240Hz if I were LG, 120Hz for each eye, using a 2:2 pulldown from the original 60Hz 3D source material for each eye). It also means scaling to 4K can be done quickly and cheaply on the set itself, since a simple 2:2 line doubling is something even an old cell phone could do, though the results will be about as pleasing as original upscaling DVD players were (think jagged edges, aliasing artifacts and the like at large screen sizes).
It's a good trick, and probably the best way to do 3D on flat panels - the benefits of passive glasses, with the resolution benefits of active shutter glasses. Everybody wins!
