So, I'm sure most of you know by now that they are splitting the release of season 4 into two sets. First set is coming out May 5th but I found a link saying that the second part of season 4 will be released July 21st.

http://en.wikipedia.org/wiki/List_of_Jon_%26_Kate_Plus_8_Books_and_DVDs

Then when you follow to where it is cited that it will be released you can look at this site.

http://www.tvshowsondvd.com/news/Jon-and-Kate-Plus-8-Season-4-Volume-2/11615

I know I'm sure excited!!!