Both
Viz's official website and
Amazon.com both list the DVD box set will be released on July 29th. It was spotted by a couple of people today at Walmart and
AnimeonDVD also changed their release date for this box set to June 24th.
Be sure to check out your local store to see if they have them in stock as all the online stores I checked still have it setup in their system as pre-order only.
Could the recent Shogakukan-Shueisha Prods. deal have been one of the reasons that the release date was drastically changed for this dvd set? It seems as though some changes might already be happening at Viz and Shogakukan. It's pretty obvious that these DVD don't take long to master, so they were probably ready anyways. With the announcement of the DP DVD's coming out later in the year, Viz probably wanted to get these DVD out as soon as possible so it didn't interfere with the sale of the DP DVD's.
It will be interesting to see if the second box set which was also announced recently will also get a release date change. Hopefully in the future they will give more notice of release date changes.