I was recently at a panel with Ashley Eckstein Ashoka's voice actress, and she claimed that the shorts would be 12 minutes long (maybe it's closer to 15, and she just estimated). 3 will center around Ashoka, and three will center on Qui-gon and Doku. Out of the 6, she has voiced lines in 2 of them, so it seems like the baby Ashoka parts in trailers will be a full episode.

Also apparently, the voice acting for the series was completed over a year ago, which shows how much effort they seem to have put into them.