We haven't written a spec because we don't intend for this to be widespread. However, the spec would basically be: run both X25519 and NewHope concurrently, concatenate their outputs and feed that into the TLS KDF as normal.

It is indeed a combination of R-LWE and ECC because it doesn't yet seem reasonable to depend on R-LWE alone. Not only because of the possibility of implementation faults in NewHope, but also because of the possibility of significant crypto-analytic advances against R-LWE, even with classical computers.