To add a few facts:
1. Cybook supports various fonts in Mobi format, HTML format, and TXT format. It supports Unicode and probably Arabic texts in Mobi format, but I believe it won't support them in either HTML or PDF. At least, it doesn't support Polish letters in TXT or HTML, no matter if the font contains them, doesn't support UTF-8 or anything beyond plain ASCII in TXT, or in HTML.
2. Bookeen, makers of Cybook firmware, plan to release two versions of firmware. One will support ePub, and will either not support Mobi at all, or will support only non-DRMed Mobi. The other will have DRMed Mobi format, but not ePub. This is due to Amazon restrictions on letting device providers use Mobi format. So if you want to have ePub, you might not be able to have Mobi at the same time, and possibly might not be able to read Arabic texts.
3. Bookeen are *very* slow in realization of their promises. The version of firmware we're currently waiting for was to be released on New Year's Eye, then two weeks before the end of March they said it'll be ready for April, then sometime in May they said they'll release it "on Monday", then a month ago at a meeting in Paris they installed newest firmware, apparently fully working, on some people's Cybooks. Since then, silence. So don't rely on features-to-be.
4. Bookeen are also known to ignore support emails from many people - and other people have found them to be reacting quickly and replacing broken devices. I hope you'd belong to the latter group.
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