One of the new DTs for…DT is in the “exclusives” category and is called “4th Floor”.
The text says “Dog Tag Awarded to 4th floor participants”

My reader can’t get a grab of the QR Code, alas.
The gold thing is common on security passcards for office buildings (in the US at least)
As for the dates, 20131029 12:00:00 obviously refers to noon on BF4 launch day.
The other one, 21420612 17:00:00 draws a bit more interest. It refers to 5 PM on June 12, 2142.
Disclaimer: the following may be wild speculation, or the following may be “on to something”. It remains to be seen.
2142 was when BF2142 was set, obviously. And June 12 was the final day of E3 this year.
In BF3 and BF4, DICE has thrown in BF2142 Easter Eggs on MP maps. As well, “Carrier Assault” could perhaps be considered not-an-Easter-Egg Easter Egg.
Plus, under Rogue Transmission, a crate under the map has 2143 written on it.
For BF3 (released October '11), DICE released the DLC packs in the following manner:
- CQ: June 2012
- AK: September 2012
- AM: December 2012
- EG: March 2013
However, DICE is fast-tracking the DLC for BF4, with Final Stand due out “Summer”, so probably August or September.
Now, this could just be “because” or…
maybe they are hauling ass through BF4 DLC launches so they can get the dev teams over to…
working on a BF2142 HD remake as prep for “2143”.
Perhaps the “17” means the first news of 2142HD and/or 2143 is coming July 17 (since DT comes out on July 15 and 4th floor is a DT dogtag)?
21420612 17:00:00
Or maybe you read it backwards as “7/12 16” as in “July 12 at 4 PM”?
Only DICE knows…for now…