My guess is that the 2015 Worlds results will actually be pretty important to qualifying. With OCR and the 2016 Worlds very close geographically and time-wise, there could be a very large international contingent that comes for both. If that is the case, there is a very good chance there will be restricted entry for the 2016 OCR.
US Berths to the 2016 OCR will be given as: top two finishers at 2015 Worlds, and a third slot (if available) to the top finisher at the 2016 MLK regatta.
Basically, the qualification could very well be cut down to 3 boats before the qualifying events even start.