I have been following this thread over a month now. while I am worrying my 65V10 will have the black level problem (currently < 300 hours and NO problem yet) I went to Best Buy for the WDTV live today.
there were 65V10, 63B550, 151FD, UN55B8500 and tons of other flat panel on displays. they all feed with some kind of movie trail and have the black bars on top and bottom of the screen. When no doubt the 151FD and B8500 have the best black on the black bars to my eye, it seems the LED B8500 has better black than the Kuro 151FD. However, the 65V10 still wins the 3rd place to my eye and is way better than the 63B550. the gap of the Black level between the 151FD and 65V10 is noticeable but not by much. However the difference between the 65V10 and 63B550 is huge.
Maybe this black level problem really doesn't affect EVERY 12G panasonic plasma? one thing tho, I don't know how new is the 65V10, the TV stand have a 65V10 since 2 months ago when I was shopping my TV but I don't know if it was replaced with a new 65V10 within last 2 month.