So im considering getting a g2 but I had a couple questions if I may
I'm considering rooting the device if need be.
Any slow motion video options?
Nope. (Though you can always record at 60fps and slow it down in whatever video player you use.)
Is there a physical camera button? I assume not given the button placement.
Nope
Does rooting affect the battery life?
Nope - I'm rooted and battery keeps going and going
Battery life is the big reason I'm looking at this phone. I currently have a note 1 so keeping the same screen size is a bonus. An upgraded camera would be second on the list which this seems to have although low light shots aren't great?
Low light shots are a world better than the Note1 (which i moved from). I've also compared indoor shots with a friend's Note3 and the LG is much better.
That said, the de-noising algorithm can blur images too much sometimes and most indoor shots have 1/10 exposure time, so subject movement can result in blurs, though the OIS helps negate hand shake in that regard. Another issue with the stock camera is low framerates when recording video.
I'd strongly suggest getting the Xdabbeb's Camera Mod on XDA, once you're rooted. It reduces the de-noising and give a 1/15 exposure option. It also improves the viewfinder frame rate (which is terrible on the stock camera), and puts a lower limit on low-light video recording framerates.
I've also been considering a lumia 1020, nexus 5 and even an iPhone 5s but in fairly certain I couldn't handle that small a screen which is also a problem for the lumia.
Some comments. If I'm not too busy tonight (Which i probably will be) I'll try and dig out some shots in difficult lighting situations.