In a mail to
support@bookeen.com they give me this response about firmwares and dictionaries:
Thank you for your interest in our new product.
The Cybook Orizon also has the folder view option.
This Cybook will be natively compatible with EPUB and it will not be possible to have two firmwares. The PRC format is currently not compatible with the device.
There is no embedded dictionary. We are however aware that this feature is very important so we plan to include it.
I have a Cybook Gen 3 with prc/mobi firmware, all mi files are in prc format, I like this firmware: folders view, the covers of books, dictionary lookups,.... In the new Orizon i haven't this.
I think i purchase the new PocketBook 603.
Regards