collin
Explorer
Keith said on his blog post "To be absolutely clear: Project Raptor is NOT an official sourcebook. Unlike the Wayfinder’s Guide to Eberron, this is being produced by KB Presents alone and will not be supported by Wizards of the Coast. This is your glimpse into my Eberron; it will be released on the DM’s Guild, and available in print on demand."
As far as I am concerned, it will be much welcomed source material at my table, WotC official or not.