It's official now. As someone previously mentioned, The Concrete Cowboy and Dogwood are the site of a proposed new tower. It's Kairoi again, and it's an apartment tower.
CNTRL-U
view-source:https://www.bizjournals.com/austin/news/2020/05/14/developer-buys-west-sixth-street-site-apartments.html?iana=hpmvp_aus_news_headline
EDIT: This is a little confusing, but Kairoi bought the 1/4 Block where Whiskey Tango Foxtrot is located, and another entity allegedly has the The Concrete Cowboy and Dogwood site under contract.