I'm in Canada and weeks ago clicked the "notify me" link on both the Canadian 950 and 950XL pages.
Pre-orders for both went live on Monday 16th. I received an email from Microsoft on Wednesday [2015-11-18 6:21 PM (EST)] regarding the 950 only, titled "Microsoft Store In-Stock Notification" and with message body:
Product availability notice
Microsoft Lumia 950
Good news: This product is now available at MicrosoftStore.ca.
Order Now
Please note that these are available only on a first-come, first-served basis.
Despite what it says, the microsoftstore.ca product page shows "Pre-order now", and near the top, "Ships by November 25th". It's also only available in Black... no White option is offered.
No 950XL email was received and in fact the Canadian 950XL page has since reverted to "email me when available", and "coming soon".