You are right. These are the new 2nd edition courses, with some activities made a bit more challenging and some completely new activities added too. As a result, they are now longer, but this simply gives you more flexibility as you can choose which ones to send.
Additionally, in the suggestions field, each activity has a type such as core, extra or challenging.
Core activities are deemed essential for the flow of the lesson, while extra and challenging provide extra support or stretch your students if needed.
I hope I've answered your question and let me know if you need anything else!
The EF Class Team