Hello,
Is this a bug, feature, or am I missing some thing?
You're not missing anything, it's kind of a misfeature because the Bidi_Mirrored property is not taken in account by ConTeXt (yet). Happily enough, it's one of the things I'm sponsored by Google to implement as a part of my Summer of Code project (http://code.google.com/soc/2008/tex/appinfo.html?csaid=8BC22C657B7F0D0E) -- of course the project is more general and there is a part on bidirectional behaviour, but I didn't get to it yet. In this case, I guess the mirroring property should be added to char-def.lua and handled accordingly; contrary to XeTeX, LuaTeX doesn't know it intrinsically, so it has to be dealt with at the ConTeXt level. Incidentally, you may note that the guillemets are not mirrored (although I observed some incoherent behaviour with the Geeza font on the Mac). Arthur