Not sure why it is so important to people what "generation" we call it. Why not just use the model years and options (A vs AE vs ES)? Then you know everything that you need to know about the bike including the paint color.
As has been stated, there are changes in almost every model year that make them worth differentiating.
As to the new 2016, if I were in the market to buy a new FJR, I'm not sure that the 6 speed transmission, or the fancy LED lighting would get me to write a bigger check for one vs. a leftover 2014 or 2015 ES at a lower price.
Personally, I think that the added gear is going to be a negative, as the gear ratios of the old 5 speed are perfect already. Moving those gears closer together means when you shift the engine rpm will drop less. On the 5 speed the rpm drop is ~ 1k per shift. How much less would anyone want it to drop and why? The one really nice thing about the new transmission is that they modified the gear dogs, so
hopefully no more popping second gear transmissions? I guess only time and experience will tell, as that trait is not limited to Yamaha 5 speeds.
The slipper clutch and assist is probably something worth having, but I bet it will be retrofittable to the earlier bikes, possibly all the way back to the earliest first Gens.
The basic LED lights (2016 A models) may also be easily retrofittable to 2013 or later bikes with the same plastics, but I'm not sure what that gets you beyond added bling factor. Comparisons with the halogen headlights will be interesting. The adaptive cornering headlights (ES only) seem gimmicky to me, and not something I can imagine wanting all that much. Maybe if I rode in the dark more often I would feel differently. I'll bet folks will still put a set of aux lights on their bikes.
I like the color (and that it
is a color) but I love the color of the bike I have now.