Apparently Nintendo is starting to cut 3 IC legs on (some of?) the newly produced wiis to hinder modding. While I haven't seen any like this yet, there are
reports of such wiis in the US.
As for the board revision missing pad # 3, that appears to only have been released in Japan and Europe.
In any case, I do several wii mods a day and I've yet to see either of these 'revisions', so chances are you'll be fine. You do still need a triwing however
