The epub3 support for Japanese vertical layout got me hoping KT will now support right-to-left epubs as well.
I upgraded to v2.0 and tried displaying a right-to-left epub3 file, with both Hebrew and Arabic, which is displayed well in Calibre.
It didn't work. The text was displayed left-to-right on my KT.
I hope that with epub3 now starting to be supported, right-to-left will also be supported soon.