Yes , Audio and Video is upcoming current New Trend in SEO.
Now most of user do not want to read out so much lengthy articles or discussions.
If you can write then you can also speak also or can create a video on your different topics.
Audio which users can download and hear in anytime when they can for understand title or concept
Video is for those in which points are mentioned on blackboard and clear 1 by 1 to step basis more easy for all..
As fast we adapt this new formation of SEO we can go next step to.