Combiner sets would be easy as pie, lets hope they do get released when they have had some time to get in better modellers, most of the tweaks I've seen from board members here (especially on Prowl) have put the original design to shame.

As well as any full size sets, I'd love smaller scale combiners, where each individual componant is only made up of 20-30 bricks, for alt mode and a very basic robot mode, to instead focus on a more detailed combined mode.

Imagine the price for sets with 5 Kreons!