In my methodology courses I always mention 21st century learning and emphasise the need to change the way we teach. Here are some sources explaining what is 21st century learning and discussing how actually classrooms should look like today.
On the website called Partnership for 21st Century Skills, you can find plenty of sources explaining 21st century learning. The following graph illustrates the Framework for 21st century Learning, as explained on the website.
You can also find pdf documents on various aspects of 21st century learning. This document is specifically about 21st century learning in relation to foreign language teaching.
This blog post tells about 14 things that are obsolete in 21st century schools.
Here you can find a document listing 10 ideas for 21st century education.
This article writes about how 21st century classrooms should look like.