well they are different companies so one getting a dvd release doesn't mean anything for the turtles.
As far as i know 4K!ds dvd releases are not usuall in the season format, though they might be trying to break it, with Pokemon while we don't have 'seasons' (since japan doesn't have it) they have started to do box sets of single releases, the pokemon advance first 4 volumes were put together on a 3 dvd boxset, nothing special but at least some type of box. they also did this with master quest ending the master quest 'season' in two box sets instead of 10 volume releases.
hopefully for ninja turtls instead of having 4 volumes combined into a box set we actually get seasons, i wouldn't expect them for a while though, but who knows dvds act in mysterious ways,
hope that made sense.