Correct me if I'm wrong, but there isn't much differences between software on both phones, so one would think that they could release it for both phones!
For the most part, yes, they are the same except for the 2nd screen. That could have taken some extra time. Or LG decided to wait on the V10 since it launched right about the same time as MM.
2nd Screen, Finger Print Reader, different camera software, HiFi DAC. Let's give it a little time before we expect it to drop. The current software to me is running pretty damn good so I'm cool with not having 6.x right away. It will arrive and hopefully relatively bug free if they do it right.
I'd rather wait awhile and have it work right than have them rush it and be full of bugs like Lollipop was at the beginning. Phones is running fast and smooth as is.