Oh no, not a french version... It would spoil everything

It's fine as it is, in english IMO.
About the trailer : as Hunk said, there is a strong feeling of sadness in this video, Leon seems very alone in a devastated world. This feeling is stronger in the trailer than in the actual Biohazard 2 game. The music has something to do with it of course. And Leon's words in front of the mirror are clearly disturbing.
About the dead bodies of the Outbreak characters, I do think it's creepy. It's a wonderful idea, and I hope you have others like this in store for us, Dominion.
About the new rooms, I can't wait to see more. I don't know if you're planning to add Bio 1.5 rooms, but I really hope you will since all the backgrounds have now been extracted from a Bio2 beta disc - that room with the yellow targets seems to come directly from those backgrounds but I'm not 100 % sure tho.
Tidus : après c'est une question de goût, mais moi ce trailer je le trouve dérangeant, comme Hunk je le trouve triste. J'ai du mal à saisir comment ce trailer peut te laisser aussi imperturbable, mais c'est une question de perception personnelle.
Ce mod a un rapport avec Bio2, oui ; Dominion utilise Bio 2 comme base (personnages et pas mal de lieux) pour recréer sa version de l'histoire à lui, avec probablement à la clef, de nouvelles énigmes, de nouveaux monstres, un nouveau dénouement à l'histoire, etc. Il utilise le matos de Bio 2 (bruitages, skins, certains décors) mais je suppose qu'il est possible qu'il ajoute d'autres éléments (concepts ou physiques) qui proviennent d'autres Biohazard plus récents. L'avenir nous le dira.