Crazzy you have added an extra week.
In the graph you posted a link to the points represent the numbers at the end of the weeks.... so the week where it crossed 1.69 million was in fact in 2007.
What the PS3 has actually sold for 1st 6 months of 2008 in Japan is: 2,251,309 (figure for the week ending 29th June) minus 1,759,650 (w/e 6th Jan) = 491,659 Edit.. never mind this itlalised bit =)
So if in the first 5 months (January sales high in Japan, MGS4 release) it sold 560k... I don't think it can sell much more than that for the second half.
The best it could get imo would be ending the year around 2.85 million, which is 600k for the second half.
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So far in the first 6 weeks (of 26) it has sold about 63k, I would probably expect similar sales for the next 6 weeks... bringing it to about 125k... maybe a bit higher for 6 weeks after (spanning September-October) taking it to 200k in 18 weeks.
I am unsure what kind of boost it could get through November-December as it was helped last year by the 40G release and lots of other things....but maybe 200k for the last 8 weeks is reasonable, ending the year around 2.65-2.7 million.
