Don't forget there is also the combiner wars cover with Devastator on it that was teased by IDW in the last month or so.
There has been two Encore Devastators just recently so the mold is there to use but I can't see it being viable sitting on a shelf next to other more advanced combiners.
My money is still on a Titan made up of 6 Voyagers, if a general release, which I expect, they'll make up their mold costs in pure volume of sales.
