I took a quick look at the new firmware.
The most interesting new feature I came across is called "remote license release". Some books allow only a limited number of simultaneous copies to exist on a customer's devices. Remote license release provides a mechanism to see which registered Kindle apps/devices currently have copies downloaded and provides a means to remotely delete a copy from another device to free up a download for this Kindle.
There is also a new feature to remove "invalid downloads". This may be associated with remote license release.
There is also something called "ereader unified sync milestone 2". Perhaps they are working on improving Whispersync.
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