Wasn't the delay "conspiracy" because they decided to give the 360 version a disc because of some weird issue of haveing it downloadable on XBOX LIVE?
And since they were releasing all episodes on one CD for XBOX they had to finish all the episodes which would not have been finished by the original release date. So instead of releasing episode one on PSN/PC first and waiting till later to get the CD for the xbox going, they decided to just finish all the episodes and release them all at once for all platformes so that no one was left waiting. Also with that extra time they were able to fix some of the bugs in the earlier episodes as well.
Isn't that what happened?