Is there a way to setup a global library of assets common to all projects?
I’m afraid there isn’t - that is a good idea though. In practice the complicating factors are that projects can have project specific asset types, however those should be easy to filter out.
Slightly related to this, we have plans to introduce content packs, which are project agnostic and can be “mounted” in any project. So e.g. an environment set would reside in a shared location and you could “mount” / include it into your project.
The more I think about it, the more I like your idea of cross-project discoverability given all the content we’ve already released. Let me FWD this thread to some folks here.
That would be AWESOME! =D
I´m trying to develop and unreal4 workflow for archviz, there´s a lot a assets that would be common to many projects and an external global library or mount shared location would realy come in handy =)
I won’t lie to you, anything that resembles Unity’s Asset Store will be a win in my book 
That’s a different concept. Epic’s Marketplace will probably be something like the Asset Store. What Camarão suggested, is a way to easily share assets between different projects of yours, i.e. without having to manually migrate assets back and forth and have a local, shared asset library instead.
any news on this topic?
You can make Directory Junctions (Windows) / Symbolic hard links (Unix) and link a folder.
References wont work though so it is advised to use them for “raw” assets only like Textures, Meshes (geo only) and such.