They did not publish the 5.1.1 source code yet.
I need a copy of this to compare to the other versions. I suspect that it fixes the recently discovered serious security loophole in 5.1.0 that allowed executing arbitrary code on a kindle touch by visiting a WEB PAGE, which was reported to amazon.
We need to see how this affects our jailbreaks and hacks. We also need to check the main and diags kernels and partitions on this new kindle.