I figured the next gen RAM HD both gas and diesel with have a 8/10 speed transmission. Aisin already makes both a HD 8-speed and 10-speed so it's only a matter of time.
I'm not sure what all the negativity is about with 6-speeds being enough. I remember a lot of hoopla over half-tons going from 4-speeds to 6 a few years back. Most were worried their truck would shift too much. It was probably the same when folks went from 2/3 speeds to 4 and so on.
I couldn't imagine trying to tow my current setups with only 4 speeds never mind any trailer. It would be too frustrating.
I love my 68RFE. It does what it needs to do without complaint. With my current setup, I use all my gears. Sometimes I wish there was a gear between 5th and 6th. With 8/10 speed HD transmission, I don't think you'll see much higher OD gears but you will probably have a much broader gear spread from 1st to 8th/10th.
Our Durango has an 8-speed and that thing is fantastic. It's always in the right gear.