It’s perfectly possible, you do it exactly the same way you did in UE3. I’ve done it here (this was UE4 beta). https://www.youtube.com/watch?v=6OTB6GhzZgQ I don’t have the material network handy, and I DIDN’T use real-time reflections because they don’t work very well on translucent surfaces. I just used the old cube-map + reflection vector technique. I might reattempt it with realtime reflections now I have a better understanding of how translucent surfaces work.
There are some problems with your material. Glass is not metallic, and not rough. You’ll want to nuke those values to get lifelike reflections, then use the specular input to tone the effect up or down. You’ll also want to preview opacity in the level, because the editor grids seem to draw on top of everything (I really don’t like the new grids).