Source : Apple InsidersMac users expecting to purchase a LED-based display MacBook Pro 15" have probably already noticed it, the shipping date for such models is significantly longer than for other models. You will not be able to buy it from Apple resellers or Apple Centers, they are all out of stocks. This is particularly true for the entry level model sporting a 2.2GHz Core 2 Duo, with an expected shipping date of 7 to 10 days.
The reason would be a shortage of 15" LED-based backlighting. It might become a major issue for Apple as August and September are usually an important purchasing period as students and future students are usually buying their notebook for the next college or university year.
[translation by Linathael]