I can find 0 evidence the 7L is going in the Raptor.2019 is the 50th Aniversary of the Boss 429, Ford has already brought back the Boss 302 so why not bring back the Big Brother?
There’s no way the 7.0 would fit in the s550 so they’d need a new body style or at least a modification. In 2019 the Mustang is getting an update which could allow the engine to fit.
The 7.0 is being produced starting next year at Windsor and is going in the New Raptors so that gives Ford a block to build off of tallow Ford to produce a true Boss 429 with the correct size engine.
It's all rumors and based on the articles you read, it's the same article over and over.
I would love to be wrong.