Too late to post more details, and I need to do some more viewing, but 3D performance on the 7000 with "Despicable Me" absolutely blows my RS50 out of the water.
For the RS50, this title was unwatchable - heavy ghosting in many scenes. With the 7000, the image is much brighter and to find ghosting requires the investigative patience normally applied to winning a large Where's Waldo game...
The ability to using the motion interpolation modes in 3D is a great benefit as well.
I am using the 3rd gen Panny glasses, running in Normal Brightness mode. I tried Light, and that was also superb - maybe a touch more ghosting, but still very watchable, and orders of magnitude better than the RS50. Almost no sense of shutter sequencing either with the 7000 - the 50 has a subtle but noticeable flicker.
Perhaps the new JVC's will match the 7000 performance, but I'm suspecting the higher speed panels are going a long way to making this projector as good as it is for 3D. Given the new JVC's have the same panel speed, they will need to gain light output and reduce ghosting through other techniques or processing.
The complete projector story is more complex than this brief comment, and I hope to post more details tomorrow - but for now, know that if 3D is an important criteria on your projector feature list, the 7000 seems to be a clear winner.
In fact, its 3D performance might make 3D viewing a more important factor for you if it wasn't already - with the RS50, I sort of gave up on 3D for the most part. If more titles that I test show similar performance, it will make me look forward to viewing 3D...