Hi,
I am not sure the big store idea would work. Many of the game store go to the big stores to buy the product at MSRP, then sell it at their store for the inflated price.
I think that morphing is a mechanic that fits for SoM. One when a creature is in the morph form it is colorless. This goes with the idea of artifacts, and if moves well from RoE which introduce a strong colorless format. This also allows the idea of the land, and inanimate objects being creatures which seems kind of the whole idea of a world of living artifacts. I do think that you will see Sacromite myr in SoM. We may be seeing the idea of the colorless world evolving into the different colors of magic. But we will find out in a few months.
I am not sure the big store idea would work. Many of the game store go to the big stores to buy the product at MSRP, then sell it at their store for the inflated price.