It was only yesterday that Cyanogen definitively confirmed AT&T's treacherous move to lock down the Galaxy S4's bootloader, but there is light at the end of that tunnel. No thanks to AT&T but to security researcher extraordinaire and a person I admire Dan Rosenberg, a.k.a. the magician, a.k.a. the root whisperer.
Dan, who is responsible for numerous root and unlock exploits, tweeted this photo of his Galaxy S4 earlier today:
There are no instructions or blog posts explaining the unlock at Dan's blog yet - these should be coming in the future. When, you might ask? This part is not decided just yet, for a good reason (put down your pitchforks).

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- AT&T's One X Left Out Of Bootloader Unlock Program – HTC Cites "Restrictions" As Reason For Cold Shoulder
- [Update: Now With yakju] How-To: Download And Update GSM Galaxy Nexus To Android 4.1.1 Manually (Jelly Bean JRO03C)
[Updated: Q&A] Dan Rosenberg Has Unlocked AT&T Galaxy S4's Bootloader, But We Won't Get To See How For A While - Here Is Why was written by the awesome team at Android Police.