I'm no expert when it comes to the 3D technology LG is using so this is just my $0.02 worth. The article stated "Starting in the 3rd quarter of 2011, LG has circularly polarized the light coming out of their televisions to create the illusion of 3D images."
Perhaps there has been no fundamental changes to the hardware used on the 2012 TVs. LG supposedly made changes to the 3D algorithms in 2011 that were much discussed but never documented. The claim was that these firmware changes improved the 3D performance to the extent that LG were able to achieve 1080p 3D certification. Some people, even a professional reviewer, said that they saw a definite improvement in 3D performance after a certain update. Others disagreed.
Maybe the 2012 TV's hardware has been tweaked or improved to take full advantage of the firmware changes made last year. I haven't seen the 2012 TVs yet so I cannot confirm whether I see improvement or not. However, for televisioninfo to state:
"Overall, this is the best 3D technology we have seen. We really like the images, they are mesmerizing and fun to watch. It does not get tiring, it is not sickening, or exhausting, it’s just 3D, the way you have always pictured it to work.
it must be damn good.