延期7 年遅れ確度 56%Given as scheduled, per the source[1]: "In autumn 2027, the South Line 15 should be up and running between Pont de Sevres and Noisy-Champs."
The first section of Line 15, the 76km ring at the heart of the Grand Paris Express, has slipped repeatedly and is now expected to open between Pont de Sevres and Noisy-Champs in autumn 2027.