In the past couple of days, there have been multiple new reports of non-US kindles coming with 5.1.1 preinstalled, and this version number survives reboot.
We need copies of these firmware images and kernels to analyze (main and diags), so we can update our hacks to work reliably on them.
It would also be very helpful if somebody could intercept a 5.1.1 OTA update and send that to us for analysis as well. Contact one or more of (geekmaster, NiLuJe, itab, knc1) who will contribute to this required firmware analysis phase.
P.S. who else is working on firmware analysis lately?
Until analysis is complete, we can only guess at the changes (if any). 