My problem - the sticker says nothing about mobi-support. If there would be Adobe-DRM-support AND Mobi-nonDRM-support, I think, mobi would be in the list.
Imho - the sticker shows the (near?) future, not the current status. So maybe the epub-firmware will not be far away, as otherwise Irex states features for the DR, that doesn't exist. And that is a party for lawyers...
And - I have no time to convert all my mobi-books (all without drm) into epub. If fbreader supports mobi - well, this would be ok for me. ;-)