As much as I hope it is released for our phones, a single person who does live chats all day may not be the most rock-solid source. Any number of things could turn out to have happened, from misreading an information sheet before giving you said information to her being just plain wrong.
Thank you for posting this though, it is important that up to date information like that is made public. Its just that I'm not sure if one representative saying it is on its way is a complete confirmation.
Does anyone know how reliable these live chats usually are?
Not very reliable in this case since they are not allowed to give too much information out to the public. I posted a thread after I talked to one of Samsung's live representatives and they told me that the update would come in a matter of weeks. You can check my thread out if you want.
I was talking with AT&T repair regarding my phone freezing when switching from portrait to landscape since the 4.3 OTA and they told me they were not aware of a fix coming out for this, but that 4.4 will probably come out in a couple months and it may replace whatever is causing the problem. When I went to the Samsung Experience center to let them force the OTA onto my phone again to see if that would fix the issue, that tech said the same thing about 4.4 coming out, but he thought my freeze issue is hardware related.