I'd have to pass, just because especially with the different races and classes available, a prologue that would actually fit any character concept would be so generic as to be boring. Easier to let my imagination cover the background.
As much as I like the OP's and other posters' ideas, I have to agree it might not be great in reality. It would require making a separate tiny "origin story" for each origin and several races/backgrounds for it to make sense story-wise.
I don't see a problem with the background stories. We're all level 1 PC's with 0 XP, so we could all just come from our basic training, eager for adventure and fame.
The main purpose would be, to add a D&D flavor to the story beginning and some of the claasical fun things for old-school D&D fans, like:
"Should I buy this ring mail, or just studded leather and a bow."
Or try to find some more money to get ring mail AND a bow.
And also learn something about the world in the tavern, maybe even a small town quest.
Now, as a cleic for instance, I awake from my pod, armed with shield and mace and a leather armor. Hmm, strange.
Otherwise, I could find my chapter 0 belongings in a crate beside the pod, which seems less strange.
But you could make chapter 0 skippable for those who want to dive straight in the heat of the escape chapter.
Although, in that case there may be a complication with XP. It would ean you can gain no XP in the chapter 0. Still, this could be solved.
