I have heard all portions currently kicking around. I have not yet heard the entire thing end to end, so my comments are of course provisional on that.
I like Oxygene 3. I think it is pleasant listening and quite in the spirit of the first and original oxygene. Much more so than Oxygene 7-13 ever was, in my opinion. It has some of that same dark, moody depth as the original. Track 17 is really quite catchy. It's no Part IV, but then it's not trying to be. But it still is pretty catchy. I think this album is a graceful, well layered, and artistically successful closure to the Oxygene saga.
I don't however think that it is either spectacular or astonishing, and this is not criticism. The original Oxygene ASTONISHED me when I first heard it. Many things factor into that, of course. I was 12 when I first heard it. I'm now 53. And the world itself, as the saying goes, was young. Maybe my arteries have hardened for what astonishes me. But I certainly do think it is of good quality, and even if it should turn out to be the case that Jean Michel never creates another new studio album again after this, it would be a final bow that does his legacy proud.
Part of what hit me so much on the original Oxygene, was the melody of Part IV. Even a great composer like Jarre probably only gets one or two melodies like that in a lifetime. This said, Equinoxe was probably my favorite album overall, first because I like great melodies, and second because it probably has the closest resonance with my own emotional "character." I dissent from many Jarre fans, I suspect, by disliking Zoolook profoundly, though I can recognize its innovation.
So if there is to be another Jarre album in the future, I would still hope for a volume 2 in the "Equinoxe" mood. Highly melodic, deeply emotional. I wouldn't want him to do the same thing again, but it is like Mike Oldfield's Tubular Bells sequels. Each is sufficiently similar and yet sufficiently different from the previous ones. Mind you...*he* might have taken it a bit too far!
These are just my personal opinions. Your thoughts are welcome.