These are all the episodes for each season. Before these sets, iTunes was your best bet for getting the episodes, but I just learned that they are missing five episodes from seasons 1 and 2. iTunes is also missing A Sitch in Time as a movie. For some reason, you can buy the "Future" segment but not the "Present" or "Past" segments. The second DVD set has the three parts of A Sitch in Time, so it will be interesting to see if they are the original broadcast versions or if they have been edited to be more like the movie version.
I hope that Disney will release Season 3 and 4 pretty soon. It would also be nice if they would start releasing other TV series, such a Lilo & Stitch so we can get the cross-over episode between KP and L&S.