The phrase "Custom dice mechanics enable players to contribute to the unfolding story and decide whether their character succeeds, by how much, and how much it will cost them." has a lot of different ways it can be interpreted.
A modification of the Roll & Keep system could fit just as much as the Genesys system.
22 minutes ago, Mirith said:I wouldn't get your hopes up too far. I really can't imagine they would put this much effort into their generic system, then not use that system for a flagship IP they are releasing at the same time.
Lots of factors need to be considered. Genesys may not have needed as many dev resources considering it was a genericized version of an existing system and the new L5R rpg's release is a ways away.