Guys, the update is real. My local authorized repair shop has ordered the part. You have to tell the Level 1 rep at 1-800-SAMSUNG that there is a FW upgrade for your TV that you need to be installed and that the Level 2 people are aware of this and to please transfer you. They will then assign you a Transaction Number and xfer you to L2. You MAY get a L2 person who is not aware of this, because their internal computer pages covering FW updates was not itself updated as of Friday when I called. This can only last so long at L2, I don't know how many of them there are, but the word will get around soon enough. Mine called the "engineers," who confirmed it. There is a part number for each of the LN-Sxx9xD's. L2 faxes your local shop, whoever that is. Then you call the local shop to schedule an appointment.
The Justcan feature affects only the HDMI inputs, nothing else. VGA is already 1:1. Component and ATSC/NTSC/QAM (96 series) will continue to have overscan. (I am not missing my logos on any ATSC signals, so I don't know what your problem might be, Foxfan. It's only ~2%.)
Why would you want this? Technically, an overscanned picture has been scaled to a small degree. Unnecessary scaling causes pixel overlap which appears as blurring. My 4696 is painfully sharp already, but for exacting applications as a computer monitor, you should be able to see an improvement in close-up fine detail. I was told that the update will not be by USB flash drive, but instead a board must be replaced. I have the SM, and there's really only two boards, the main board and the input board. I don't know which one they are replacing. Frankly, I would much rather them have updated the crappy de-interlacing chip if they're going to replace the main board. Now there's some real blur. BTW, the name of their de-interlacing/scaling chip is the "Albatross." Now there's a real winning idea....
We should, however, be grateful that Samsung finally came through on this, because this will be at some not inconsiderable expense to them to add a feature not included in the original spec's. Another sign of a good outfit. You could almost say, the REAL "Like. No. Other"