I think the partial problem with Lumineth is in the vein of the Engine Wars book, that it should be out already or released very soon. And GW does like to have something to show on release as well, at least for the full new armies. So they want to show something off, but still keep something back to get hype on release day.

Giants look like big giants. Don't really care about them though. People seemed to want some Knight-like faction in AoS, so they might be satisfied with this.

Warcry band is interesting. Nice to see the mistweaver aesthetic returned. Will be nice to see where that goes. It is also a nice way to add units to existing armies as well, considering these are Daughters of Khaine themed. (Or at least Morathi-related)