I picked up my watch this morning from Apple. I saw availability at one of my closer apple stores and reserved it yesterday afternoon. Picked up a nylon band to go with it as well (42mm, silver alum). I wasn't sure about 42mm but after trying it on and since my main purpose for it will be fitness, I think it is fine. Fitness watches are generally huge anyway. It is definitely noticeably thicker than my AW0.
I also saw the Nike watches in the case and I was disappointed with the look of the band although wearing it around those with trypophobia would be fun.