What is the new IELTS One Skill Retake?

Last week, IELTS IDP announced that they are planning to introduce a new test called the IELTS One Skill Retake. This will give students the opportunity to retake only one section of the four skills (Listening, Reading, Writing or Speaking) in the IELTS test if they did not achieve the score they aimed for the first time around. Obviously, this could make a HUGE difference to the experience test-takers have of the IELTS exam, but there are still many questions left unanswered at this stage. ...