interesting download on Scribd to my attention and it prompted me to do some digging around. The file is allegedly a 5E guide to the World of Greyhawk and was uploaded by one "Chris Perkins".
Whether this is truly WotC Chris Perkins or just attributed to him is uncertain, but given his history with the setting I wouldn't be surprised. Don't get me wrong though, this is by no means a secret 5E Greyhawk document in the works. In fact, I don't see a shred of game material here, it's editionless information. The guide presented here is a well laid out, indexed mish-mash of Greyhawk sources and art from the "gold box" all the way to the Living Greyhawk Gazetteer. The use of a sans-serif font also evokes that old school D&D feel to this document. All in all it's a solid Greyhawk primer.
One note, a perusal of the preview pages shows the section on festivals includes as far as I know a new town called Obsidian Bay. This place is where the homegrown nature of the document stands out. A simple search found a decent personal wiki devoted to a Greyhawk campaign centered on what I can only assume is the same Obsidian Bay. The wiki belongs to The Griffin's Crier a site devoted to the cool sounding Blackrazor Guild and their variety of RPG campaigns including yes, a 5E Greyhawk campaign.
The Perkins confusion aside, if this guide does indeed belong to these guys I'd like to at least commend them for the effort. Wikis and personal campaign guides show a level of love for the setting that goes beyond the published works. It's a reason I belong to Canonfire and do this blog. If anyone from the Griffin's Crier reads this shoot me a reply and I'd be happy to talk some homemade hawk!
Update 7/2/18: Chris, the author of this document is not the other Perkins guy, but is a big fan of Greyhawk anyway. Check out his reply in the comment section and his new site, Scruffy Grognard, HERE.