The total cume until 3rd weekend of OS-China = 1.155B. The estimate below is based on the total cume till 3rd weekend of each country, the prediction for number of tickets sold at the end, the discussion of members in BOT:
UK: 105M -> 125M, +20M
SK: 96.6M ->106.6M, +10M
BRAZIL: 72.5M ->88M, +15.5M
MEXICO: 69.5M ->76.5M, +7M
INDIA: 60M -> 65M, +5M
GERMANY: 54.5M -> 62.5M, +8M
AUSTRALIA: 52.2M -> 59.2M, +7M
FRANCE: 51.8M -> 60M, + 8.2M
JAPAN: 42.7M -> 53.5M, +11M
RUSSIA: 41.3M -> 46M, + 4.7M
INDONESIA: 33.3M-> 35M, +1.7M
ITALIA: 31.6M -> 33.5M, +1.9M
PHILIPIN: 31.2M -> 33M, +1.8M
SPAIN: 28.5M -> 34.5M, +6M
HONGKONG: 26.5M -> 28.5M, + 2M
TAIWAN: 26M -> 28M, +2M
THAILAND: 25.6M -> 27M, +1.4M
So, OS-China can be 1.155B + number of countries above = 1.268B
For the rest countries, I don't know.