Everything you mentioned has been discussed recently.
At any rate:
Kepub vs. ePub is still valid. Both have their strengths and weakneses.
Kobo Touch Extended is mostly useful to me as it auto-converts to kepub (the format I prefer) when sending books to the reader.
Built-in dictionaries haven't changed that I'm aware of. But then, I really think how bad the dictionary is has been overblown (caveat: I only use the English dictionary and to be honest, I only use it rarely).
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