I'm in the same boat. It'll be a while before the next G device is out, unless LG become like Sony and ramp up the release cycle to every 6 months (I hope not though).
Think only time will tell, see what the reviews are like and how it feels in the hand. It's quite a bit heavier than the G4 and might be too much of a handful.
A G4 sized V10 would be ideal for me, but appreciate that they have to have things to differentiate each model and suit all tastes. Love the fingerprint reader on my iPhone 6, it's the one thing I wish they'd put on the G4.