SNCF just unveiled the TGV (Train à Grand Vitesse) of the future; TGV M. It will not be faster, but it will carry more passengers, more aerodynamic, more disability inclusive, better energy efficiency and carbon footprint. It will be premiered in 2024.
https://www.cnn.com/travel/article/tgv-m-next-generation-high-speed-train-france/index.html