Speculation is that Ronaldo will wear number 9 with Real Madrid. He apparently trademarked a new logo and brand, called CR9. I expect he'll switch to number 9 for the Portugal national team, as well (unless he can't because someone else has claimed the number; I can't see that scenario happening).
I still think this can work out for Manchester United, if Sir Alex
makes the right call on replacing him. As of right now, I'm in favor of
him spending 30 million pounds on Karim Benzema from Lyon and about 25
million pounds on David Silva from Valencia. Although, United are apparently
the favorits to get Luis Antonio Valencia from Wigan for approximately 15-19 million pounds.