Not quite sure what you mean, I'm talking about a softcore update.
The daughter board will add ethernet and usb connectors, maybe digital audio and some other odds and ends which will set just above the current sd/dvi connector.
The io panel just gets some more holes in it.
The base board is staying as it is!
/MikeJ
This has probably already been asked, or suggested. Do you have the layout of the daughter board finalized with it's external port placement fixed, so you could make the i/o panels made with easily removable openings for the daughter board ports, in addition to the openings for the Replay board? The ports openings for the daughter board could be cut out all the way except for at two or four slender points of metal holding the closed opening in place that could be easily removed if/when the owner of the Replay board gets a daughter board to add to his Replay system. In this way you could produce one i/o panel for Replay boards with and without the daughter boards.
I hope this makes sense. It is harder to describe than it is to make.

Edit: Is the revised daughter board design going to sit above the double height Joystick ports, or will the daughter board have a cut-out to go around the higher ports? I know the first design of the Replay did not have those ports stacked on top of each other and some comment was made which I thought said that the revised daughter board would have a cut-out and go around the stacked ports, so it would not be on top of them. I suppose it could sit on top of the stacked ports, but have the Ethernet and USB ports on the underside of the daughter boards, so that they would still fit in the space of the i/o panel. If the daughter board sits lower and close to the top of the Replay boards FPGA and other chips, will heat be a concern with the reduced airflow?