EDIT 2019-04-17: There have been credible and (as of this writing) not properly addressed allegations of sexual assault involving a DataCamp executive against an employee. In light of this, we can not currently endorse that anyone takes this course.
It looks like some of the new in-line display behavior is back-ported to R Markdown and some of the difference is the delayed running and different level of interactivity in the HTML document. This makes it a bit hard to call out which RStudio’s improvements are “R notebooks” versus “R markdown”, but it means there is a lot of new functionality available. I’ve updated the video to reflect the subtlty (unfortunately on YouTube that means a new URL as you can’t replace videos).
And some just in case decelerations/clarifications/reminders: this video is not from RStudio (the company), and Rstudio client (the software) is a user interface that is separate from the R analysis system itself.