I am hoping someone in the forum has experience of when Apple coordinates the pre-installation of a new OS with iMacs purchased through Apple's Store online. That is, when will iMacs configured through the online store come with High Sierra pre-installed? The day of the OS release? A couple days before? Weeks after? I realize updating to High Sierra won't be difficult, but I'm looking to purchase an iMac by the 25th (an education promotion with free $300 wireless Beats headphones ends that day) and it would be one less thing to do if it was already installed -- and perhaps it would have the Fusion drive formatted to APFS out of the box. Cheers.