Remember, Apple has 9 days before the end of the month and probably would not hold an event on Halloween, giving them 8. At most, that would allow a week's notice for press invitations and preventing many media sources from attending, which Apple would not want.
I think that Apple can still launch this machine this year, but it will have to be at an unusual event. It would also likely be alongside the modular Mac Pro that has been long awaited.
What do you think? Do you think we will see the 16-inch MacBook Pro this month?