http://www.acura.com/ModelLanding.aspx?model=RL

Looks like it's mostly the same inside and underneath, except I don't recall seeing reference to the voice control feature.

New transmission, spruced up engine, bigger wheels...

There is a good video about the sh-awd on the site above.

 

So, wait. Did you buy one, test drive one, ride in someone else's? I'm a little lost.

 

The only major changes since 2005 have been:
-Motor (Up to 3.7L from 3.5L)
-Transmission (6-speed auto now)
-Better transmission ECU (Faster shifts, don't have to put into sport mode for paddle shifts, and I think it rev matches on downshifts now)
-A few exterior styling changes (Headlights, taillights, front and rear bumpers, grill, exhaust tips, chrome strips moved from mid-door to under the doors)
-Added ventilated seats
-Added iPod connectivity, USB input, AUX jack, Bluetooth

That pretty much sums it up I think. It's still the 2nd gen RL. The new model is coming next year as the 2014 RLX.

 

This seems appropriate:

 

...me lost

 

One other change is supposed to be a reduction in noise level, thanks to added sound insulation and the Hemholtz resonators built into the wheels.

I'd be interested to hear from anyone who has experience with both the 2005-08 model and the 2011-12, on whether the new one really is noticeably quieter.

 

I can't even find a 2012 to try out...

 

I've been waiting for a 2011-2012 RL to come into the shop so I can check out the Helmholtz resonators in the wheels.