Does anybody know the status on the champ mastery and hex crafting stuff advertised in pre season?

At the end of last year when they had that giant pre season page advertising all the stuff coming in season 6, one of them was the new champion mastery additions. I don't remember for sure, but I think the cap was going from 5 to 10. But more interestingly, they were going to have a new crafting system added with it that allows chests and keys to be gained with champion mastery in some way. And when you opened the chests, you could get stuff like champions, skins, and I forget what else. And if you didn't like what you got, you were supposed to be able to break it down into hex cores or something I can't remember to craft new stuff.

Either way, while I can barely remember the details, I definitely remember it being advertised and haven't heard anything about it since. Does anybody have any clue on the progress of the system? Or can somebody at least tell me that Riot gave up on it?