Spaces marines such as the standard marines won't get capes. Such things are reserved for captains and above. (or scouts) But with the unknown hero classes coming at some point, who knows if one of those is a captain.
bE mentioned a while back the reasoning why they didn't have more cloth physics in the game when they compared it to HB belts. They stated that Unreal 4 Engine currently has issues with cloth physics, that Epic is trying to resolve and I hope eventually will. The Warlock robes are counted as part of the character model bypassing this "bug/Issue" Weather or not that stands as an issue know I don't know I just assume so since they can make a killing off pelts and robes off SW/DA players just to name soemthing.
Still means no capes or cloaks. They will be in Eternal Development, like new maps, finished animations, and content that gets mentioned a few times and then ends up buried in a martian vault and is never talked about again because nobody knows how to make it work. But hey, at least we get a shoulder plate with Big E's angelic visage on it.
Wait, don't warlocks already have cloth physics? Like actual ones, not static junk? Couldn't they just copy paste that?
I'd rather have them static ones if they were supposed to look like they currently do. Warhammer AoR Archmage robes anyone? That could work for warlock.