I'm not optimistic about ever seeing anything new out of iRex (software or hardware). I like my iLiad as-is, with the community developed software, and I think if we want a new content lister we'll have to make it ourselves. I don't mean to be negative, but I just don't see iRex ever changing their habits. They didn't want to be in the end-user market in the first place. They may still be looking for B2B clients, but with all the competition in readers and more coming soon, I think they've really lost the initiative.
I'd love to be wrong, of course.