Well, let's wait for announcements to determine if TDO has "cheaped out". I think it's likely that RSR isn't the only thing that will happen even if it will be the headliner.
Also, in terms of unique attractions, the entire Beauty and the Beast section is unique to Florida and looks to be pretty stunning. I know it's not a ride, but it's certainly something of value. Also, smaller things like the Casey Jr Splash area and Pete's Sideshow are unique (admittedly, they are just minor attractions).
In terms of rides, it's a refurb, but Test Track is unique to WDW. And Pandora will be if/when it is built.