So if the conventional Fox 40 is the end all to be all, why would Fox bother with the inverted design?
Is it possible that Fox sees something that you don't?
(although it could be purely a sales thing, but I'd like to think of Fox in a higher regard then that)
Funny side note, when Moto's first went to the upside down design, a ton of people complained that they were too stiff because the the large diameter uppers. The forks didn't offer enough flex in the longitudinal direction. If the forks are too stiff in the torsional direction this can also be a complaint or problem. Pinkbike is not the only ones appearently that think a little deflection can be good.
If you look at later years kyb forks they are actually feeding flex into the upper legs because they were too stiff. Your bike and mine have these forks with the shaved material.
The older RM right side up forks were considered one of the best forks on the market, until Zuk changed them to inverted because of public pressure.
2 weeks ago I dnf'd a race because my fork twisted in a crash. Its just the nature of inverted forks, even if the are off an mx bike.
I'd be guessing Fox won't be switching over to inverted because of added stiffness. Instead I bet they are looking at reducing manufacturing costs and possibly giving into marketing hype a little.