Vice Adm. Craig S. Faller. US Navy Photo
Navy Times reports that the nominee to replace Admiral Tidd as SOUTHCOM has been identified as VAdm. Craig S. Faller, currently Senior Military Assistant to the Secretary of Defense.
We know, if confirmed, most of his fleet will be painted white with racing stripes so this is potentially important to the Coast Guard.
Chuck Hill's CG Blog 
Looks like confirmation may be delayed. https://www.militarytimes.com/news/pentagon-congress/2018/09/25/democrats-question-past-ethics-of-southcom-nominee/
Confirmation hearing for the new SouthCom. https://news.usni.org/2018/09/25/sasc-quizzes-southcom-nominee-drug-war-command-control?utm_source=USNI+News&utm_campaign=1ffbaa8fca-USNI_NEWS_WEEKLY&utm_medium=email&utm_term=0_0dd4a1450b-1ffbaa8fca-230448833&mc_cid=1ffbaa8fca&mc_eid=e873a959e6
Adm. Faller confirmed. https://www.militarytimes.com/news/pentagon-congress/2018/10/12/senate-confirms-new-leaders-for-southcom-us-forces-korea/