Just looking at the video on my phone, but I would have guessed Ethereal since they've used that at other shows/introductions and from some some directions it looks silver and others more white (my favorite color BTW.) If so, this is a nice find since there aren't many examples to view.
Also they seem to like pairing that particular color with the Pimento interior as a stock combination. (Which does look great but I think I personally would prefer Almond). There is a 2020 L405 Ethereal/Pimento currently listed in Chantilly. No pictures posted yet though so it would be hard to compare. They're are some pics in that forum on this site though that you can search for but they mostly look like a metallic white since it's so hard to photograph.