Apple has just released a second GM build of iOS 4.2 for iPad to developers. There's been several reports of wi-fi issues on the iPad under iOS 4.2 and it looks like this should address them. There were also rumors of iOS 4.2 being delayed due to the iPad issues.
As you can see from the screen above, the build number for the iPad has now been appended, meaning there's a new build. The original GM build was 8C134. The new iPad build is 8C134b. Hopefully this will resolve issues quickly and iOS 4.2 will drop sometime next week. If any developers see any changes other than the some general bug fixes for the iPad wi-fi issue, let us know! I only looked briefly but don't see anything other than iPad bug fixes.