Vol 5 is out now apparently, but has some pretty serious problems. First off, the eps are in production order, not air order, which means that the storyline is scrambled, and some eps are spoiled.
Secondly, only 13 eps are on these two discs, but Disney has told at least one person who wrote to them that this is the "entire" 2nd season. That is patently untrue, as S2 has some 24-25 eps. It appears Disney isn't going to finish the release (which shouldn't surprise anyone, how many shows has it done this to now?)
Does anyone have any newer or better information?