Panasonic has been pretty clear they're happy with the ST60 as is. Most likely, any firmware updates will be Smart feature app upgrades, like a better browser or so. I highly doubt the various bugs will be fixed, such as HDMI Content = Auto not functioning properly, 3D overscan, the ridiculous edge halos from scaling, 1080p Direct getting edge halos, and so forth. Don't count on ANY of those being fixed.
However, some good news. Some of the PCB's are shared across the various models of 2013 Panny. Tomorrow I'm going to disassemble the PCB's off the panel so I can match which parts are which on the parts ordering website. I think my original hunch is correct, the 3D panels aren't really all that different other than the bezel and the filter (pro, ultra) applied to the glass. The A board will be where most of the quality comes from. Wonder why the 3D on a ST60 isn't so good compared to say, the VT60? Because the chip that handles the 3D, the Mediatek chip, is a totally different design by a 3rd party, not Panny. It's also a lot slower, so that's probably why the input lag is so high and the cross talk on 3D is being marked during reviews. I'm guessing this has nothing to do with the panel itself.
Anyway, my main concern is the Focus Field Drive. I'm not sure if the A board controls the output or the scan drive. There are 2 possibilities on why the ST60 might have different scan drive boards than the VT60 - size, and Focus Field Drive. The minimum for the VT60 is 55, which means in order to frame the panel correctly I'm guessing the boards have to be larger. If size is the only reason why the parts would be different, then it's possible even the Focus Field Drive is controlled by the A board , in which case a swap should be super easy.
I'll update more tomorrow. It's literally my last day I can tinker on the set, before I make a final decision that it goes back. Hopefully Panny UK is as responsive in getting me a parts site I can start to cross check. If the 50GT60B (3000 FFD) has identical scan drives as the 50ST60 (2500 FFD,) and the 55VT65 (3000 FFD) has identical scan drives to the 55GT60B (3000 FFD,) then I can deduce the scan drives are not responsible for FFD and it all boils down to the A board. In which case, I'll be buying one for sure. Anyone up for some $1050 - $1150 50 inch VT60's?