Hmm... realistic sales, eh? I'll take a stab at this (all numbers are worldwide)-
August w3 (current week) : ~100K (More hype will be created on people wanting and preordering the slim.)
August w4: ~50K (Low supply level will severely limit sales.)
Sept w1 (Slim launch week) : ~400K (Preorders of the slim sell, supply is semi-restored.)
Sept w2: ~250K (Continued sales of system in areas with low supply, middle of nowhere areas are normalized in supply levels.)
Sept w3: ~200K (Supply levels off and resumes normal availiability.)
Sept w4: ~160K (Normalized level, will remain at this level through October.)
Nov w1+2: ~180K (Holiday pickups start.)
Nov w3: ~250K (People trying to beat the rush.)
Nov w4: ~500K (Do I really have to say why?)
Dec w1: ~400K
Dec w2: ~500K
Dec w3: ~650K
Dec w4 (X-mas week) : ~800K (or halved, if there are supply problems)
Dec w5: ~400K (Giftcard time; if supply constrained, ~300K instead)
Jan w1: ~250K (Supply will start to normalize if was constrained.)
Jan w2: ~175K (Closer to 200K if there was constraint.)
Jan w3: ~140K
Jan w4: ~120K (Sales will stay around this level barring any huge releases for the next several months.)
Please note also that these numbers do not account for any large game releases. However, I do not see GT5 pushing a ton of systems; I believe that GT5P did that already. I also do not see FF13 making this calendar year; I see it being bumped to Q1 2010, add 200K for Japanese sales on week 1 of release.
Oh, for comparing to the other consoles, PS3 will beat the Wii for the first 2 weeks of September only. 3rd week will be close, but I see the Wii slightly beating it again by that point. As for the 360, PS3 will beat it by ~500K in the month of September. The October-December period will have the PS3 outsell the 360 by another ~750K for the duration, as MS will announce price cuts for the holidays.
-dunno001
-On a quest for the truly perfect game; I don't think it exists...









