This has been confirmed for DLP but not announced for WDW. Just because something is happening at DLP does not mean it will happen (or happen in the same way or structure) at WDW, especially because they are two very different parks. I wouldn't be surprised to see some paid component to FP but it's too early to say that it's coming soon to WDW.
THIS. Exactly this. Here is the breakdown of FastPass systems at Disney parks around the world. Note that no two properties have exactly the same system.
California = FastPass (paper) and MaxPass (digital). A predominantly local audience. 20 attractions available. Two parks at the resort. A free option and a low cost digital option. Both allow same day access to passes.
Tokyo = FastPass (Digital and paper) and Standby Virtual Queues. 18 attractions available. A predominately local audience. Two parks at the resort. Resort guests can get a set number of paper “anytime, any attraction” passes as part of booking a package. Both allow same day access to passes. Standby virtual queue works in the same way as Rise of the Resistance boarding passes. A virtual queue that uses a lottery system. Not all guests that want to access can, but it is random chance.
Shanghai = Disney Premier Access, in place since Mar 2017. 8 attractions available. A local and tourist audience. One park at the resort. A single pass is 120 Chinese Yuan or about $18 USD. A pass set of 8 for 660 Chinese Yuan or about $100 USD. Allows only same day access.
Hong Kong = FastPass (paper). A local and tourist audience. 3 attractions available. One park at the resort. Scan your ticket at kiosks at the attractions and obtain a paper FastPass. Free to access. Same day access only.
Paris = Disney Premier Access and Standby Virtual Queues. 10 attractions available. A local and tourist audience. Two parks at the resort. Passes will now cost between 8-15 euro ($9.50 - 18 USD) per attraction. Free standby virtual queues will be available as well.
Florida = Unsure. Previously FastPass+ (Digital). A predominantly tourist audience. 65 attractions available. Four parks at the resort. Resort guests could book 60 days in advance. Annual passholders and day guests could book 30 days in advance.
Looking at those options: WDW is an entirely different resort than any of the other properties worldwide. And no two properties use the same system. Not even Shanghai and Paris, as DPA is different at each park.