UPDATE: Disney has now pulled the Rivers of Light dining packages page.
Earlier today, a page for dining packages associated with Rivers of Light went active on Disney’s website. As you can see from this screenshot, there is a date of May 1st listed in the “Know Before You Go” section of the site:
Originally, Rivers of Light was supposed to debut on April 22, 2016. I think it’s probably more likely that Disney posted this page that was created to go live when Rivers of Light was supposed to debut earlier this year, and has not yet updated it with the information for when the show is actually going to debut. In other words, I don’t think this listing of “May 1”–without any year–confirms anything. I think it’s more likely the page just got put up prematurely and that the availability date hasn’t been updated yet. (The fact that Tiffins–which is widely suspected to be a package option, but did not open until May 27, 2016–isn’t listed in the “Know Before You Go” section also seems to be in line with this.)
On a related note, I did call Disney Dining to try to make a reservation for the Rivers of Light dining packages and the Cast Member (after talking to her supervisor) said that the option is still listed as “coming soon” in her system and that they have no information about when the option will actually be available.