Good news- I spoke with TDOS today and the revised driver's license manuals with the 'Share the Road' section are currently at the print shop. They should be printed and released in approx. 2 to three months. A test question is being prepared to be added after the new comprehensive manual is released.
Also- TDOS operates a motor vehicle network displayed on big-screens in the regional driver service stations. The network features safety messages targeted towards drivers and, as of April, they now have a '3 foot rule' spot AND a Share the Road spot playing on the network! Unfortunately these can only be viewed at the driver service stations so there's no link for me to forward to you, but I was able to view it at the station over on Hart Lane near my house. Very cool!
TDOT Bicycle & Pedestrian Coordinator