OK - finally see the range 482858 to 500140 and from 503167 > has the extra relay
(the earlier range is presumably the retrofit)
This is essentially the same scheme as used on Sprints - it has a constant feed to the starter/headlight-cut relay and then an additional relay enabled by the instrument lighting circuit to disable the power to the headlights when the key is off.
So it achieves the goal of bypassing current through the key-switch, but does nothing for improving their efficiency.
So, going back to the original question at the very beginning of the thread:
... I've read a lot about this ignition problem that can be resolved with the EB relay. I just bought a 2014 roadster.
Does anyone know if the newer bikes have the same problem?
The answer is definitively NO - the headlight current no longer passes through the Key-Switch. So is resolved in that regard of the reliability issue.
However gains in the light output performance can still be had by installing a relay kit with better wiring scheme.
Note also however that the R3T does NOT have this extra relay, so its current still flows through the key-switch. But that is only 5A since it's a single headlight, vs the 10A of the Roadsters.