You can now create a course with multiple, individually administrated sessions, so a course could run say for every Monday for a month. Previously you could only define how many days a course ran for, not which days and not over non consecutive days.
In addition you can now upload an application form for your users to download when viewing and there is more room for adding prerequisites and describing the training or course more fully.
All this extra session information is of course displayed to the user who can now see exactly what times and what days the course is running over and can also search for courses or training in specific areas.
Cheers, and keep volunteering!