During the early 2000s there was a lot of talk about reboots and reimaginings of projects, so much so that certain creators decided to make a tongue in cheek approach towards it with parody episodes that involved using such plots and cranking the dial up to 11 on the cheese factor.
This was when the creative staff had the ability to know this was a BAD IDEA to do and to mock it soundly. Unfortunately the Winchesters creative staff have not gotten the memo of this and Jensen Ackles is in the middle of this as the main face behind this series push.
See, I've made it no spoilers because there's no reason to, as all I need to do to explain something is to highlight one thing that's going to sour fans of the Supernatural universe entirely.
No care for continuity.
We know the back story for John and Mary Winchester, we've seen them meeting for the first time, falling in love, the deal that sets in motion both the events of Mary's fate and John's obsession, so telling us that there's this huge other story that we weren't seeing that wasn't hinted at, talked about or even referenced during the 15 years of Supernaturals run, is not only an insult to the fans but to the lore of the franchise itself.
Nothing in this series is worth watching and nothing good comes out of it as it is largely mediocre fan fiction writing that tries to tell you the way an angst ridden teen would think about the parents of the heroes of the world.
I certainly hope this never gets a season 2.