This certainly showed up without warning, as it has been found in a US ToysRUs store... and will probably annoy those who already bought the Devastator set.

As a ToysRUs exclusive, the Kre-O Devastator set is made even bigger by adding in a small Ironhide (resembling the TFPrime figure), a 7th Kreon (human), plus an out-house to go with the construction site.
But wait, there's more... Instead of the green Devastator Kreon (minifigure), this set gets the Gen2-coloured yellow/orange Kreon.
So maybe the recently listed Gen2 coloured Devastator on the Hasbro site was not to say that it would be a minifigure that would be sold on its own anywhere, but was Hasbro's way of tipping us off that something new was coming for the Devastator set.

The original set had 560 pieces:



The TRU exclusive set has 781, meaning the Ironhide is a decent build of about 200 pieces (with about 20 pieces for the out-house and extra Kreon). Vortex is almost 200 pieces... or for those with the first series, that would make Ironhide a little bigger than Ratchet or Prowl, and a little smaller than Sideswipe.

Maybe the Hound Kreon (which was shown off at the beginning of the year) suggests another store exclusive has been put together as well.

Price-wise, the regular Devastator was US$80, while this one is US$95 (not bad considering a 30% increase in size for only a 20% increase in price, and a store exclusive at that).
We probably won't see this here though, even if Kre-O wasn't being discounted at heavy losses, because the AU$ amount for this set would be $150-200 if TRU released it here.


On the bright side, for those who already bought the regular Devastator set, this would allow for displaying Devastator and the individual Constructions.