@ Anders.
How is the BV5 doing? Does it exceed your expectations?
My experiences till now are resulting in more questions then answers...
I've received my HD ready kit. It contains of a DVI module, software and a instruction how to handle.
I had also to order the DVI extenson cable and the DVI plate. So I mounted the parts.
That's quite a job. That's because I removed the panel to install the DVI plate. Later it seemed it wasn't neccessary to remove the panel.
The extra digital audio cable goes to a free socket on the Dolby Digital board.
After entering the servicemenu, I've mentioned the DVI module in slot 2 as "camera".
Then in the socketmenu you can enter the "camera" function and rename it as PC(DVI).
So now after a PC instruction the panel switches to the DVI module.
That was expected, but also surprising because the instruction says you have to update your D7 panel and mine is a D6.
So, one question is: what does the sw -update (which has to be done via Beowise) do?
For now it seems to work.
I've attached the DVI to a pc, and I got a "new hardware found" message. First thing I saw was "Beovision 4-5".
The question still remains, where does that come from? The DVI unit has Panasonic labels on it and it hardly has any components inside.
The softwareupdate wasn't required, so again, what happens inside the panel? It probably hasn't anything to do with the DVI module.
I also attached a VGA computer monitor to the socket which goes to the panel.
I wanted to know if the different mk chassis's sends different VGA signal to the panel, has every mk a different VGA board inside?
The answer is that every chassis sends the same VGA signal to the panel. It is a standard RGB signal 
So, if you want to change your panel to a newer version, then the new panel still has to handle ordinary RGB SD signal.
So, that's not the problem of changing. Only one thing I can think of is that the panel has to scale the SD signal to the right resolution of the new panel. And it is common known that the internal scalers of the panels aren't the best.
It's obvious why the BS3 has its own scaler and sends the recalculated signal through DVI to the panel.
The BV5 ('s panel) does it analog versus BS3 digital.
But then arisses the question about formats 1, 2 and 3. What does it do to the videosignal from the chassis to the panel?
Nothing.
Changing formats didn't influence the picture on the pc-monitor, so the formats are set through the RS232 cable!
I hope and have not discovered/searched yet if the panel has an automatic wide setting. If it has then the RS232 instructions could be missed.
That's for now, will be continued..