Japan Probe has posted a video of a few rikishi getting into a car and driving off during the current Kyushu basho. One wrestler was identified as a Mihogaseki rikishi, and Mihogaseki oyakata was reprimanded by Hanaregoma rijicho. It appears that this is all the action that will be taken.
The Sponichi Annex reported the driver as 31 year old Jonidan 25 East Koryuyama (currently 3-1). The other wrestlers in the video were not identified.