I've been listening to Reprise almost whole day, so I'll try to write my experiences. First of all forgive me my poor English, too much repeating words and not enough musical knowlegde.
En Lumiere - typical MdM intro with great harpsichord sound and some church bells in background. At the end there is a "message from hell" form reverse side of obi. Sometimes it sounds like Dialogue Symphonie.
Dialogue Symphonie - at the begining it sound very similar to old version, is only a some different sound of guitar at one moment and later some church bells again. I'm not sure how to say it, but sometimes guitar sounds more likely to d+sect, even if the melody is still the same.
Front et baiser - the begining is more slowly and Seth's sing it in different way, then there is the same intro like in old version, though the sound of the instrument is again slightly different. A few notes in singing are little changed and they are shorter (I really like that! it annoys me in Juka's voice). Also added some megaphone effect.
Solitude - Intro is the same but sounds better. Sometimes background piano seems to be changed a little.
the Prophet - horns sound are more extended, then it's very similar to the old version. At least I hear some English, not like Juka's version
Invite to Immorality - Again, a little different sound and it's shorter, only 0:33. And there is no voice.
Nocturnal Romance - Very similar to the original version
Vestige - Some small differences with longer sounds at the begining, I can hear the background violin a little better.
La dix croix - Again, no bigger changes, only Seth sings some other notes sometimes.
Secret longing - Almost no difference.
Pageant - Also very alike.
Je l'aime - I love the intro. It starts with organs, then some strings and choir, and sensual Seth's voice, some bells at background. Then it gets a little faster with guitars and organs. Sometimes there are some "switches" and it sounds more like a mix of songs. The melody is very rich. At the end there is lovely a capella singing. And is quite long, it takes 6:22
Overall, Mana did a great job with these remakes. I'm very pleased with these. There is no bigger changes like he has done before with Ange, Tentation and the others. But everything sounds better and more "juicy", bass line is definitely better. And now I can say without any doubts, that I prefere Seth's vocal. He improved a lot since Beyond the Gate. Even IMO Juka has better tone of the voice, he has some mannerism which I really don't like. His sounds are just too long, I don't know how to explain but it's like he's trying too hard. Seth sings more smoothly.
I think this cd is more for people who's listening Moi dix Mois a lot. I could say, those who don't like them that much won't hear much diffrences.