Repertoire for White against Sicilian Dragon

We will present a repertoire to face the Sicilian Dragon with White. This is based on an early O-O-O instead of 9 Bc4

 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 O-O 8. Qd2 Nc6 9. O-O-O !?

here's the key position

Black has 2 ways to play :

9..Nxd4 followed by Be6 and attacking on the queen-side
early d6-d5 -since White did not play Bc4-