Ceramic or NiCaSi (Nickel Calcium Silicon) coating on the bore will provide higher durability of the engine block. Based on my reading about this ceramic coating block, it can provide better heat transfer that relates to cooler engine. On TV, I have seen a ceramic coated cooking pan that have the properties of non-stick surface and very durable. I think the ceramic coat on the UMA Racing engine block also works the same, it provides higher durability with the added slipperiness for the piston to move.
29 more pictures courtesy of Syark86 (thanks!) after the jump
Item is available for sale here