Is there going to be any way to watch the 2016 Olympics
on Roku in the US for those of us without a cable or satellite subscription?
NBC will broadcast it, so you can watch Rio Olympics 2016 on NBC Sports Live.
That is true, mostly. The regular NBC broadcasts normally include only what the NBC decision makers think are "important" or "of interest." They do not include lower level sports, like women's field hockey, or sports that are dominated by non-USA people. NBC also tends to inundate their regular broadcasts with "Up close and personal" drivel that really does nothing to enhance the experience for many folks.
However they have been moving away from their fluff broadcasting by providing detailed broadcasts of much of the events. That will NOT be on the regular NBC channel but rather those broadcasts will be spread throughout the entire NBC family of channels including all those from NBC Sports Live channel to MSNBC. So to get full Olympic coverage you must have access to a quite wide variety of the whole NBC family of channels.
Having said that, as was pointed out earlier, NBC has hinted at a dedicated application (This could actually be the NBC Sports Live) that will stream all Olympic events. Of course they will not or have not confirmed exactly how the Olympics will be available. Even emails asking very specific questions get responded to with vague answers or evasions.
I have now set up many different ways of access NBC channels for the period of the Olympics so the I will miss nothing I am interested in but I have also been unable to come up with a good way to record many of the methods I have set up and NBC will not say what they will have available "on demand."
At this point in time we can only wait and see what NBC will actually do. Hopefully they do not make it too hard for those of us that have no access to cable or OTA.
Lastly, as stated earlier, accessing NBC content on the web apps or the Roku channels will require a subscription to a participating provider. That provider can be a cable company, Satellite provider or something like Playstation Vue. I have verified that Sling will not work for the NBC Sports Live.
I am reasonably sure that with Vue and the access it gives me will allow me to watch all the Olympics I have an interest in but as I said earlier NBC has yet to officially say exactly how their coverage will be accessible, particularly the on-demand part.