Some thoughts regarding the new additions:
1. Why am I not surprised, that a song of the Altarians is called "Elemental"?
It also sounds pretty good, but that's to be expected. I already love the other songs.
2. "Yor Singularity" is just... great. Cold. Menacing. Industrial. It really drives home that, if you go up against the Yor, you'll get wiped out. Swift and without error. Or mercy, for that matter.
3. Speaking of the Yor, the artwork looks great too, but also a bit disconcerting. I think, it's the "eyes". They just look... weird. Oh well, it shouldn't be a problem for me to get used to them. I mean, it's not me, who's going to have to look at those eyes, after all.
4. The "Crusader" artwork was already shown by Frogboy in his teaser post for the announcement, so it isn't new. It still looks good overall. With the exception of the legs. They just look a bit too stiff. Especially around the knees.
5. The artwork of the "Arcean Surface" looks great, but not quite as I expected it. Arcea was bombed from space. You would think, that there is more damage, especially to the ground.
6. The Mass Driver concept art looks fine. Bigger question, though, is, if they also work just as well.
7. "Xendar Servant". Now that's an artwork I don't get at all. Don't get me wrong, it looks great, but the Xendar have been wiped out by the Terrans. Why would you make artwork for a extinct race?