I thought they already came out with a firm, he's not Thrawn.
I doubt they'd introduce him now, not every Star Wars fans reads the books, watches Rebels etc.
He's stride out on to the bridge of a Star Destroyer, and Hux would go "Admiral Thrawn, the brilliant Strategist who got beaten up by a 15 year old and then was sucked into the unknown region by Space Octapus. Welcome back"
If he did show up, they'd probably Grievous him and make him slip on a spilled cup of tea while Poe cracks your mama jokes.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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