Totally agree. The War Within is a not-so-subtle dual reference to the actual war with Xal'atath within the planet and some of the character's own inner conflict. Issue with Thrall being added to this cast is that all his inner turmoil has pretty much been addressed so where does he go from here?
He does have his own short story with Durak so maybe they will introduce something there that's not so much of a rehash. Not really sure where it could go other than maybe have Durak falling under the sway of Geya'rah. But even that puts her pretty close to Garrosh 2.0 territory.