Even if it is 13%, that in no way means it won't debut until 2009 as most of you suggest. It still has well over a year to hit in 2008.
The first stages of development usually are the hardest and take the longest, I wouldn't be surprised if we got an extensive in-game trailer by TGS (Although if we don't get a trailer at least, I'll be a tad impatient).
EDIT: I also expect a simultaneous worldwide launch (Or maybe at least a US/Japan launch), especially with such high profile games like MGS4 doing the same.







