Jan 4 Free is here with the fix: http://devhost.xda-developers.com/prK and is updated on Play as well. I also added a partial fix that affected media button pause/play on wired headset cable or new lock-screen controls.
BTW, if you have Unlocked and are itching for RDS on AOSP ROMs, you can set Debug-> FM Chip to "STE AFM RX" and restart Spirit. I don't think it's 100% stable yet though.
There's also an audio method for "Digital OneXL/S" now, but it's unstable and reduces the default 44.1K sample rate and stereo to 11.025K and mono. It's not clear yet if it's possible to be stable, but you'd think a mostly digital FM chip should be.