If you look over at imdb.com vin is working on that pacifier move, but his next two roles are: a mobster movie and some roman movie. Looks like it will be a while before he starts on another chronicles of Riddick movie.
Also taken from the imdb.com forums:
Tonight, I watched a special showing of The Pacifier. It was terrible. Kids loved it because they are too young to understand good entertainment, but it's basically like Mr. Nanny (another bad movie). Diesel plays a military soldier who is protecting the life of a man that has a chip named "Ghost". The innocent victim was murdered, but 2 months later, Diesel has to look after his kids when the mom is gone. He's secretly setting up cameras to find whoever is out to capture the kids and in the meantime, the children set traps and try to get rid of their bodyguard. Even the maid leaves. Soon, they realize that he's a likeable guy and they get along with him. He helps every kid out personally, one needs help with the play Sound of Music, another needs help selling Girl Scout Cookies, etc. The jokes are predictable and desperate and I can guess almost what will happen verbatimly since it follows so closely to Mr. Nanny. Vin Diesel has no personality for a comedy, he one note and boring. The note is to be tough and he rarely lightens up, but then again, the screenplay wouldn't have been better even if he did. The reason it's called The Pacifier is because a bullish teacher in one of the kids' schools, picks a fight to wrestle with Diesel and he shows the teacher a wrestling move known as "The Pacifier." *