My guess is that it will be released tomorrow, Friday, October 26th at 10am pacific time and 1pm eastern time based on the fact that Apple has released certain products in the past on Fridays, and tomorrow is the last Friday of October.
Apple will follow their rutine of releasing products on Wednesday. So its probably on 31st oct. I cant guarantee you year as ZB90 said. But I hope it will not exceed 31st oct. wednesday because oct. 32nd or above is no available.