INFI has not been ruled out. Either way it wont be there til late June or so maybe (I cannot find the post but I swear I read that on the scrapyard forums.)
One thing is for sure, if it is INFI, they are going to sell many, MANY more than if it is 154C, regardless of cost. (at least that is my prediction.)
They never offered a sheath for the SOD...or the Muk. I dont know if they will offer one or not. I was under the impression that they do not provide one with the knife so that they can offer the knife at a lower cost and allow you to choose the style of sheath that you want for it.
To me, the S5 looks like a Kydex kind of knife. The M9LE NEEDS leather...rustprone or not.