Outlook.com Calendar Sneak Peak???
1. Outlook Web App - Is only available through Hosted Exchange and Office 365 (For Business)
2. Outlook Web App bears NO resemblance to the image of Office 365 for Education, shown in the article
3. The image shown in the article is very similar to the current outlook.com/skydrive styling.
Based on this, I think it is accurate to say that the image showing the calendar app in the article, will be very similar to the calendar that will rolled out (who knows when) to outlook.com users. The biggest difference, I suspect, would be functionality, similar to how outlook.com does not have the robust inbox management features of Outlook Web App.