According to WinRumors and Paul Thurtott some lucky individuals are seeing notices from their phones that the NoDo update is (finally) available. Not everyone can see this yet, and it sounds like it’ll be a slow rollout. In fact, in the comments threads on other discussions, those who can’t see it yet outnumber those who can.
Go and check on your phone, and report back if you can see the update or not. Let’s just hope Microsoft doesn’t completely screw this up, or brick any Samsungs this time around.