I don't think they will play much differently than the original S800 iron that came in cast and forged other than being softer in the new FC-One forged. They are narrow top line and slightly narrow - medium sole a players irons for sure.
The FC-One Pro forged will come in satin and black. I have no idea how the black will wear. The FC-One black finish on the FC-One wedges does wear.
Pics of S800 cast that I played in 2013.