The LG G3 Cat. 6 will offer speeds as fast as 225Mbps, comparable to what is being offered on the Samsung Galaxy S5 LTE-A. The LG G3's remaining specs are unchanged from the regular version of the phone. That means it will still offer the 5.5-inch 1440 x 2560 resolution screen, 13MP rear camera, 2.1MP front-facing camera, and a 3000mAh battery.
While LG did spiff up its new flagship model to allow for faster speeds, one thing that it did not do was add IP67 certification to the phone, leaving the LG G3 Cat. 6 as vulnerable to the elements as the original model.
source: LG (translated) via PocketNow, AndroidAuthoity