I'm still quietly confident. I think like most networks/CPW etc. information isn't cascaded down and operators just make up information.
From what I can remember last year with the 7+, I was told categorically I would most likely not receive my phone on launch date. To compensate, I was given bill credits/refunds - so it was obvious the operators fully believed I would not be receiving the phone on launch date, but then it turned up on launch date anyway.
I've only checked in with Three once via Live Chat and was told all good for Friday. Just looking at Twitter and other than specific incidents (advisors making errors), no complaints about change of delivery dates.
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I pre-ordered via telephone so don't have a confirmation e-mail and can't track through the website. But, iirc, I was also told at the time of ordering that it would be delivered between November 3rd - 10th, but when I Live Chatted with someone on Sunday, I was told all was good for Friday.