Neymar will have to choose between Real Madrid and Barcelona, between Messi and Cristiano Ronaldo, and between two different contracts. According to the media, Real Madrid's offer is quite higher, and while Barcelona would pay 7M€ per year to Neymar, Real Madrid offers 11M€.
Neymar confirmed Santos' official announcement:
I'm very proud and happy. This is the happiest day of my life. I will now make a decision with my family. I'm not in a hurry, and the decision could be made public in thirty minutes, one hour or three days.