I am thinking that PS3 hardware will be a 3 million heading into Dec next year. It will be at like 4 million by this time next year.
I have no Idea when FFXIII is coming out, but I do beleive that we will see a 200% bump in hardware the week of FFXIII(there are still alot of Harcore FF fans that are just waiting til it comes out)
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut