On September 19, 2019 the Universal House of Justice released the highly-anticipated design concept for the Shrine of Abdu’l-Baha.
You can read more about the design in this Baha’i World News Service story: Design concept for the Shrine of Abdu’l-Baha unveiled
You can also read the 2019 Ridvan message from the Universal House of Justice announcing the construction of the Shrine of Abdu’l-Baha here or listen to a reading of that message here on Baha’i Blog’s YouTube Channel.
Lastly, more information about Abdu’l-Baha, His life and His unique station in religious history, can be found here.