That's DEFINITELY the reason, and nothing else. The products are ready but Apple will NEVER release anything in the middle of such a turmoil. Why?
1) The relevant public will NOT notice and the launches shall not have any impact in light of the insanity of financial news;
2) Consumption, especially in the crumbling US economy and beginning also in many European economies, is sharply down;
3) Currencies are floating wildly, and interbank or intercompany financing is absolutely frozen all over the world. Trading companies are practically inactive as of now, and foreign markets would pay an undesirable premium for Apple products.
So any such launches are gonna happen in November, and this is an optimistic estimate. Don't dream about 14 October, as it's NOT gonna happen unless it's just about minor things and speed bumps.