I don't think you can correlate a manual transmission (where you know for sure what gear set is selected) to what the 45RFE, 545RFe or, what is it now, 645RFE?... with all their over drives and under drive combinations. The transmission/computer seems to indicate 5 for a couple different ratios.
My early May 2011 model does increase rpms by about 2-300 when taping out of D to 5 at about 70mph. If I recall went from something like 2400 rpm to 2700 rpm.
Hmmm... maybe that was the real reason for the 1 May price increase, they started installing 6 speeds
.... I jest of course.
Is is a very valid question on whether the 2012 transmission runs better/worse than the 2011 up to date with TSBs, however... regardless of the marketing.
It would be nice to hear how the 2012 operators manual describes the 6 speed operation.