VFX reel for the film, including confirmation that flashback Leia is indeed (heavily manipulated) ROTJ footage (while Luke is from TESB):
https://www.vanityfair.com/hollywood/2020/02/rise-of-skywalker-star-wars-visual-effects-vfx
VFX reel for the film, including confirmation that flashback Leia is indeed (heavily manipulated) ROTJ footage (while Luke is from TESB):
https://www.vanityfair.com/hollywood/2020/02/rise-of-skywalker-star-wars-visual-effects-vfx