This is no joke. Mike Benshe of the Linux foundation and CEO of Bitgo Inc released a short letter on the Linux foundation Website with the announcement less than an hour ago.
Being a journalist for Coinstaker.com, I wrote a quick article, which you can read there to get all of the details.
Here is the link: https://www.coinstaker.com/segwit2x-cancelled
This is truly breaking news in the Bitcoin community!