Unless anyone has any other information, I would bet the (Oculus Go: Snapdragon 821/ Quest:
Snapdragon 835) processor won't have the computing power to run ED. To put it in perspective, the charger for a Quest is 15W, yet my i5 is 65W and my GPU 160W.
So it is unlikely that you won't be able to access ED from the Oculus store for these products. Why would Frontier/Oculus want you to suffer a sub-par experience?
That doesn't mean they won't always be unsupported, I'm sure some enterprising individual will find a way to hook them up as an external PC display and link ED to them (e.g. Trinus for PSVR etc), and who knows, they say the future of gaming is streaming over the cloud so maybe Frontier/Google/Oculus/??? could find a way to get ED running in a server rack and stream direct to your less powerful headset.
Also, EDs control schemes really need accuracy (and a lot of buttons), which I'm not sure you are going to get out of the limited inputs of the controllers.