Original Author: @ChristopherZent

The new ArcGIS Pro SDK course, “Extending ArcGIS Pro with Add-Ins”, is now available. This three-day, instructor-led class from Esri Educational Services provides a comprehensive introduction to the Pro SDK.
**UPDATE** The initial online course offering is now updated to April 3 - 5, 2017. Also, June and July class dates will be added to the calendar sometime later in February.
Please see prerequisites, remote connection requirements, etc. at the course page above. Classes are limited to 12 students, so register early!

Students outside the U.S. can also sign up for Esri online courses, although you may also want to contact your local Esri distributor about adding it to their course offerings.
Also, if you're going to the Developer Summit in Palm Springs, there will be a pre-summit, hands-on training course on the Pro SDK available. More information available at this post.