Well, they were a little late, but Apple is now taking pre-orders for the iPhone 5. If you live in one of the initial launch countries, you should be able to log into Apple's website and snag a handset.
Hopefully, the company has planned ahead this time for the influx in traffic, and we won't have to spend forever trying to place our orders. Last year it took me 2 hours to pre-order the iPhone 4S...