So they'll be adjacent to the JC Penney. There was some truth to the rumor on Next Door last year.
A poster on ND who claimed to have talked to the property manager of the strip on S. Braeswood said HEB had less than 24 months on their lease and it was cheaper to pay it off than fix the store. Since they didn't own the property they couldn't make the improvements they wanted to 'guarantee' the store wouldn't flood again. So apparently they'd already been scouting sites well before Harvey.
FWIW, another poster said there were already plans for another HEB 'superstore' on the SW side not near Meyerland, too.