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Here it is, the episode that has been talked about for over a year! Everything we know about Supernatural season 13 episode 16
The official press release
SUPERNATURAL 13.16 “Scoobynatural”: Sam (Jared Padalecki), Dean (Jensen Ackles) and Castiel (Misha Collins) are transported into the animated world of Scooby Doo where they join forces with the Scooby gang to solve a ghostly mystery. Robert Singer directed the episode written by Jim Krieg & Jeremy Adams.
The original trailer
The extended trailer
The first sneak peek
The second sneak peek
Inside the episode
Sneak Peek #3
Sneak Peek from USA Today
Another sneak peek, this time from Entertaiment Weekly
The promotional pictures
 There have been many interviews with the cast and writers about this episode.
ET Canada talked with Jared about it at PaleyFest

TV Addict posted this interview with Jared and Jensen on this episode

There have been multiple articles about this unique project
There were also spoilers given at this year's PaleyFest which was covered by Wincester Family Business here Full Coverage of Supernatural PaleyFest 2018 _ Updated
Quick note from Entertainment Weekly
Anything on Scoobynatural?! — Anna
It’s fun. And although we already know that Dean loves himself some Daphne, he won’t be the only one who gets to bond with members of the Scooby gang. Let’s just say that Castiel finds himself forming bonds — and learning a thing or two — from two particular members. (And one might or might not be the talking dog.)
Hot Topic is celebrating the episode by contributing a portion of the proceeds from its sales of Supernatural merchandise on March 29 to various charities supported by the cast.
The cast is showing their support of the effort
Misha Collins is auctioning a signed script of 'ScoobyNatural.' All the proceeds will go to Dreams2Acts
Jensen posted this to show his excitement for this episode
See the discussion thread for episode 16 for BTS photos and more.
This will be one of the most unique episodes of Supernatural.  What are your thoughts on it? Are you excited to see this cross over? Do you think Sam,Dean and Cas will fit into the world of Scooby Doo?  Let us know your thoughts in the comments or in the discussion thread for episode 16.