This is super exciting!
I've written before about how I think the more FBP-style concurrency of Go and the message passing one in Erlang complement each other as much as streaming DNA processing inside the cell and fire and forget cell to cell signaling between cells do in biology:
https://livesys.se/posts/flowbased-vs-erlang-message-passing...
The FBP/CSP-style in Go being more suited for high performance streaming operations inside apps and compute nodes (or cells), while the message passing mechanism shines over more unreliable channels such as over the network (or between cells).
Ergo seems like it might allow both of these mechanisms to be implemented in the same language, which should be a big deal.