If it is true then I am buying for 10 BTC.But what will be the price?
Price? That is what is called "the market"
Depends on two factors: supply and demand. Your 10 BTC is the demand, the available CXX is the supply. Demand raises prices, supply lowers prices.
My educated guess is that the shares will start out at 5 times original price, or around 5000 satoshi a CXX.
Where it goes from there depends upon the market.