There's essentially nothing available in the ePub format, with the notable exception of out-of-copyright stuff from Hadrien's excellent FeedBooks web site. It may become an important open standard in the future. At present it is - IMHO - irrevelent.
There's not been a firmware update released for the Sony in something like a year. Doesn't really need one, to be honest; it has no significant bugs.
Enjoy your new purchase!
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