Interesting that he's teaming up with Vader in this one. Given the first novel indicated Thrawn had some sort of adventure with Anakin during the Clone Wars I would imagine that it should only take five minutes of interacting with Vader before Thrawn figures out he's Anakin.
I wonder if the story might riff on "Side Trip," Zahn and Stackpole's collaborative novella that features Thrawn, Vader, and the Noghri. Or at least take it as a starting point, much as Thrawn riffed on "Mist Encounter."
As for the William Shakespeare's Star Wars books, I admire them more than I like them. I admire the effort that went into them, but I've read better faux Shakespeare.