The COTA race has been confirmed for March 24, 2019. Press release says 3.4 mile circuit.
https://www.indycar.com/News/2018/09...-Miles-Epstein
Kind of annoys me that in the same press release Indycar is claiming/inferring to have been involved in the LBGP for 36 years. Not that 11 years is anything to sneeze at, but they inherited a decades old successful event.
I participated in the 1984 CART series race there, don't think the Indycar folks had anything to do with it.