They have not made any official announcements, nobody knows what they have planned. There was a post made on their forum a while ago about big things coming soon, but I think that post was made shortly before they announced the new Book Edition. They could have been referring to that. It could also have been referring to a software update (they're due for a new software version soon if you look at their past schedule, and they've mentioned before that they're working on a major change to the viewer framework).
There probably will be new hardware versions at some point in the future, but at this point nobody outside of iRex knows what they are or when they'll be released.
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