At this point, there really is only speculation. I'm guessing perhaps Rhyperior on rusty orange, all three pixies on red, or regigigas on yellow. those seem to be three of the popular ones for the set.
IDC what the sleeves look like, I just hope that they are decent sleeves this time, all the sleeves have been torterrible, witht he exception of the original DP sleeves, I kinda like those. The sleeves now are super super thin and snap easily.