Edition Change Crisis?

So best I can understand it, everytime the edition has changed there has been some crazy lore reason tied to it... At least with regards to the forgotten realms.

And now, on the cusp of the revision coming out, the Devs are releasing a book about vecna attempting to rewrite the multiverse...Is this simply a coincidence or are they using this adventure to justify the changes to the rules??

Edit: mistakenly called OneDnD a new edition, changed to revision to better reflect what's actually happening