Things have been relatively quiet on the Tron front since Pirates Of The Caribbean: Salazar’s Revenge's Joachim Rønning entered talks to direct what is currently known as Tron: Ares, with Jared Leto aboard to star. It appears Rønning's deal closed, as he's taken the job and is adding Evan Peters to the cast.
Peters, known for some of the X-Men movies and more recently as a stalwart member of Ryan Murphy's American Horror Story TV ensemble (he also played Jeffrey Dahmer for the prolific creator), will play a character that Disney is keeping under wraps for now.
In fact, most of the details are a mystery for now, including how it'll connect to 2010's Tron: Legacy. Jesse Wigutow has been writing the script. Shooting has been scheduled for August, but that'll likely depend on the end of the writers' strike and a potential actors' strike.