Right off the bat, the G7 spec sheet is a big improvement over the G6, since it launches with the latest Qualcomm SoC, the Snapdragon 845. The LG G6 shipped with a year-old SoC last year, immediately putting it behind most of its 2017 competition. The G7 has a 3000mAh speaker, and its dual rear-camera setup has a 16MP main camera and second 16MP wide-angle lens. The US version has 4GB of RAM and 64GB of storage (with an SD card slot if you want more), but LG's hometown of Korea gets an upgraded model with 6GB of RAM and 128GB of storage. The demo units were running Android 8.0.
The display on the G7 ThinQ is a 6.1in 3120×1440 display with an increasingly popular (with device makers, anyway) notched display. LG has struggled to manufacture OLEDs, and after the poorly-received LG OLED panels in the LG V30 and the Google Pixel 2 XL, LG is switching back to LCD with the G7.