here is the message from the author:
Sorry about that. A note from my PR rep mentioned it in error but it's really just the original Knock On feature being improved to respond faster and more reliably. I've updated the post to remove mention of Knock Code because that's not yet available.
- Andrew Kameka
----- Reply message -----
From: "firstname.lastname@example.org ." <email@example.com>
Subject: (M-Feedback) lg g2 knock code
Date: Mon, Apr 21, 2014 10:17 PM
RE: LG G2 Android 4.4 KitKat update rolling out now to AT&T (22752)
Ive read your post a few days ago and it seems very inaccurate. It says lg g2 update to 4.4. As of feb 23 2014 we have been on kitkat. Im wondering about the knock code for the lg g2 and if you have a reliable source cause att and lg know nothing of it?
dont get too excited yet folks,rumors are that its supposed to be released this month,well it seems its still unknown for us U.S users.