Maybe it's because I ordered from T-Mobile, but I ordered my iPhone SG 128GB 6s+ on the 16th thinking that the 6s+ were going to be backordered for a while and I wasn't expecting to receive it until mid October BUT I got a tracking number for T mobile last night, making me think that I'm going to get mine on launch day or near then.
By the time I ordered, I had already heard that there was a 3-4 week delay for the phone I ordered (though this delay was the Apple reported delay, not the T-mobile delay)