Lr6 is an upgrade to Lr5, not an update. You have to purchase Lr6.
Thank you for the quick reply Bob,
So does that mean I would potentially lose money (in the grand scheme?) Lightroom 6 is already at 6.7
I would upgrade (pay $79) and then have to probably pay ($79 soon again) for the next version?
Yes, you would have pay again for Lr7. There is no guarantee there will be a Lr7 but I think there will be but who am I to know. Adobe may just go all CC.
There usually is a grace period. Saying when you buy it like now and LR7 is released in late October, you will get a free upgrade. However, since nobody here knows if and when LR7 will be available and if there will be a grace period and Adobe won't tell ...
Some go this way: Buying monthly Photography CC until LR7 is released and then buy/switch to the standalone perpetual license, if you don't like to have/pay CC .. just an idea.