I don't think those are FS replacements as they would also be using a smaller paintball. notice the sabot is larger in diameter than the actual paintball.
It looks like if they were to fit into a FS style magazine then the paintball is actually a .62 which would make a little more sense but still why not just drop it down to a more common .50?
They look a lot more expensive and if we are talking just a sabot then may not get a great deal better range or accuracy than standard round. Cause not long after leaving the barrel the sabot will typically drop away and you are left with a ball flying through the air instead of a at least a conical shape of the FS.
Should be interesting though.