The Nexus 9 went up for pre-order in the Play Store earlier today, but right next to it in the device list is the Nexus 6. Oh, but clicking through presents you with the dreaded "coming soon" message. At least you know where to find it when the time comes.
Google will sell the Nexus 6 in blue and white colors. $649 gets you the 32GB and $699 ups it to 64GB. There's no 16GB this year. We'll update as soon as pre-orders go live, which is expected to happen on October 29th.
The Nexus 6 will only be on sale in the US at first, according to the Google support page. However, the Nexus 5 eventually expanded to a bunch of nations. Just give it time. Or complain to Google and start a Change.org petition. I hear those always work.