Yep, there is! It’s part of our roadmap. Nevertheless - @AlanRynne is just feeding me this reply now:
Textures and stuff are usually not good at all Revit. Even if we supported textures, you probably will still end up with a not that nice render; the best workflow we can think of at the moment is to support material matching by name - e.g, you have a material from revit called X, a matching one in Unreal - when the model is pulled into Unreal it will use the match by name. This would give you quite a bit of freedom in defining them there, with all the goodies unreal offers in this regard!
It would be good if you could have a peek and a go to what @cristi did: Speckle Unreal POC (v2). We could already implement that there!