The holiday that delayed my order is over, but I did see a notice on the HK post website that mentioned a holiday in mainland China that lasts from Oct. 1 to Oct 7th. I'm not sure if this will affect shipments out of Hong Kong. There is also a notice affecting air mail to the United States, specifically it says air mail shipments to the US may be delayed 3-5 days until further notice due to lack of space on air cargo flights. The notice was from about a month ago so I do not know if it is still in effect. I would think your shipment will ship on time, with possibly a couple of days delay. Perhaps others on the forum may know what Chinese holiday this is from the 1st to the 7th and if it will affect shipments from HK to the US.
edit: I should add that my order was shipped out about 24 hours, maybe less, after arriving at the HK Post air mail center. Its most likely in the US by now, but it still has to go through customs and then be put in the USPS system.