No chance this year : The PS3 still has 600k more sales and it remains only one week of sales before Christmas... the week after Christmas won't be huge enough to see any influence.
This week, the 360 gained 247,692 unit sales against PS3, even if next week the gain is larger it won't be 600k I think... and moreover VGC is notorious to overtrack 360 and undertrack PS3, adjustments will give PS3 a good lead this year.