The style will be different, Galthié style is almost the opposite of what White wants, the team wasn't his at all.
White doesn't like to play in his own 40, what he asks from his team in the first 40 is to create space and time for the Fullback, Scrum half, Fly half or Second five 8 to find the touch in the opposition 40, through solid and controlled rucks, the kickers always have huge power and great accuracy. He also needs a very solid lineout because it's the first phase of his offensive system and a solid counter ruck, that's where someone like Mowen will be essential. In the last 40 his teams are in my opinion very entertaining because, he sets up runs and dummy runs everywhere and the mauls are well drilled.
I have seen people question the signatures of players like Mogg and Nick White, because they aren't super stars like the players Toulon target but, these two player will probably be crucial because of their kicking game and Mogg direct running style.
Finally I wouldn't be surprised to see Catrakilis or Lucas start as a 10 and Trinh Duc be played as a n°12.