The g3 is lg's flagship phone and one of the best android devices of the year. Course its going to get L
And I'm hoping they get the update out with the quickness.... I suspect that due to the popularity of Lollipop, they might show a bit of urgency. In the past, LG hasn't exactly been know for their prompt updates, but considering the major overhaul that occured in 5.0, and the fact that the G3 has been their most successful phone ever, they might pump out an update quicker.
Still.... one the custom devs iron out the camera and bluetooth issues, we'll get KK custom ROMs (which would rule). Once that happens, and the 5.0 sources hit, I am pretty sure that we'll get a custom LP ROM for the G3 well before LG puts out an official one. (and I might very well take that route).
Though... the Nexus 6 is still quite tempting. My wife has been getting increasingly more frustrated with the shortcomings of her Nexus 5's camera.... I might switch that out for a G3, and then switch mine to a N6.... I have 1 JUMP to use between now and next July, so I'd have to use it wisely.