The version 1.6 of Learn Blender with a Poster introduce some of the new functions from Blender 2.78. New mustload add-ons: Carves, Archimesh, Measure It. Edit mode select region (ctrl+shift+RC). Driver inputs (ctrl+d), very useful to sync transformations on different axis. More connections between nodes, I'm really trying to tie functions and techniques. Minor fixes and graphic improvements.
I still didn't try - and I can't wait - the new freehand curve function, a feature I was waiting for years. My first attempt to migrate from other 3d softwares to Blender was initally discouraged by this lack: I did not find the shape vector drawing I was expecting; now the gap is to be covered. I'm sure it will be a huge evolution.