So I can set sockets on each frame of a Paper2D sprite which is great, but it seems there is no way of getting the currently playing frame of the sprite, and once I have that, there’s no way of getting a socket by name from the current frame. Why give the ability to add sockets on sprites when there is no way to use them?
I guess I’ll answer this myself now. 
Support has been added as of 4.7 preview 5 for sure. Michael said it was in preview 4, but I thought I had checked there and it wasn’t.