His past 3 full seasons have actually been remarkably consistent when you look at his per 36 minutes stats. Here are his career per 36 minute stats (4 full seasons):
5.6 FG made, 12.6 FG attempts, .445 FG%, 1.0 3Pt Made, 2.9 3Pt attempts, .337 3Pt%, 2.7 FT made, 3.4 FT attempts .773 FT%, 1.4 OREB, 4.6 DREB, 5.9 Total REBs 1.8 Assists, 1.0 Steals, 0.6 Blocks, 1.9 Turnovers, 2.8 Fouls, 14.8 Points
In 2011 he played 23.5 minutes per game for us. I think he will play more like 25 minutes per game for us this year, 20 at the SF and 5 and the PF.
So take those numbers above in the per 36 minutes breakdown, and multiply them all by 0.70 (or 70%). That's how you get to his numbers for us this upcoming season:
10 pts, 4 rebounds, 1 assist, 1 steal, < 1 block, 1 turnover