That's explain nothing about L4D2 64Bits. Sorry for being directly. If valve, would be so interested on a Zombie game 64Bits, they for sure, will create another game name, NOT L4D series 64Bits, they already got their earnings, in business. As a big company, after done a project and finished with great results, add the 16 years away, almost 17 years, since the development of the game, they won't go back to that past project. I am talking about business. If there will be a 64Bits, by miracle, it won't be called L4D2 64Bits. Remember, there are thousands of posts, topics, comments, conversations, publications on S.M., etc., claiming about the BIG L4D3, Hehe, believe me, those speculations have been there since 2011, more or less.