Default authentication in SharePoint 2013 is claims

I just found out that Classic based authentication is deprecated in SharePoint 2013.

Read here for details: http://www.wictorwilen.se/sharepoint-2013-claims-is-the-new-black

It was written during SP 2013 preview but I guess it is true well: http://technet.microsoft.com/en-us/library/jj219758.aspx

And how to check if your current web app is using which method ? 2 ways

Through UI : http://www.enjoysharepoint.com/Forum/Details/how-to-check-if-your-sharepoint-2010-web-application-uses-339.aspx

Using powershell : http://www.fewlines4biju.com/2012/08/how-to-check-if-your-sharepoint-2010.html