I have updated my post (2nd to the top of page 2) that has information on all of the season sets since I have now seen the trailer for season 6 on youtube (
YouTube - DBZ Season 6 Remastered Trailer!). I now know that it conatins 29 episodes and SSj Goku on the cover. Since Gohan did not get this cover I now predict them to put him as the Great Saiyaman on the cover of season 7. These are my only changes, hope they help.
*Note: It seems that many stores are selling season 5 as early as 10 days before the announced release date (thats how the trailer is up) so hurry over to Walmart or Best Buy and pick up your copy before it is officially released!