All the promises were done before the team was cut.
During Blizzcon: We plan to show MMR and rework the league system to be more meaningful, because matching people based on MMR while displaying leagues calculated by different point system is confusing a lot of people.
During Reddit AMA after the team was cut: We are actually still internally discussing whether to show the MMR or not and opinions on this are divided in the team.
Also regarding placement matches amount, they promised like 3 or 4 seasons ago that there will be more placement matches for people who play the league only occasionally (like less than 20-30 games per season) and that people who play it regularly will have lower amount of placement matches, even as low as only 1 game required, since for those players, placement matches mean just very little change and they are mostly used just to reset your rank to match your internal MMR. So if they would actually do it next season, I would be really happy. I was super disappointed each season I saw that I still have to do 10 matches after they announced this.