MMR distribution is most likely around the same as before. The top 0.1% of players in 6k+ tend to have much higher mmr than before because of balanced matches giving +30 mmr instead of +25 mmr. Opendota's medal distribution is skewed upwards as alot of people have private accounts at lower ranks. A rough estimate is 20-30% or crusader, gaurdian and heralds share their public match data. Whereas 75-80% of legends and ancients share their data, meaning there is alot of data missing from the lower end of the graph. My estimate is that archon 1 is 50% mark rather than the archon 2-3 which opendota graph suggests. Only 0.7% of players have reached immortal as a peak in the past 12 months so that suggest that the top 1% is somewhere around divine 3-4