Post 25 explained better than I could, besides, how do you think episodes were leaked in the past?
Various groups were given episodes, so subtitles and dubbing could be done, otherwise you wouldn't have episodes dubbed or in our case, audio described when it airs.
Blind Mice and Sero use to wait until the season ends before they put up episodes, but since this season is the shortest of all the others, I'm assuming exceptions are being made.
Once the season is over, then I would assume they'll be available as a zip file, like the rest of the TV Shows.
I am amazed iTunes doesn't do described TV Shows, at least they don't do it here in australia, I'm guessing other countries are the same.
I wonder if that's because sometimes not all episodes are described, in which case, I'd agree with the whole all or none approach.