Huh! Yeah I bet you're right, and I hope so.
The whole morality slider thing doesn't bother me except that games with it tend to pretend to be more. "Ohh, your actions have consequences!" "You totally won't choose one of the two paths and be penalized for ever deviating!" As an added dimension of gameplay in a game which has already proven itself to me, could be great. Dawn of War 2: Chaos Rising did a great job with it (particularly since it rewarded slipping to chaos, and also made it hard to undo).
I agree, it really depends on how they do it. Back when Fable first came out you pretty much decided right there in the Tuorial if your dude was good or evil, and trying to find a balanced approach just kinda left a bland bloke.
I also hope they present choices that go beyond "RESCUE KITTEH" or "SHOOT KITTEH".
But I can really see Talion going to increasingly drastic means to fight Sauron, to the point where he almost becomes the new Big Boss of Mordor himself. I mean, you're allready kinda put into that position, since you allready drafted 5 Warchiefs before tackling the black Hand. Talion would be more than capable of turning the entire population in Mordor against Sauron, if given enough time. I can actually see some more strategic gameplay coming in with sequels, from adding bigscale combat to building and upgrading Strongholds. In theory, they have a ton of room to go from here. Altough, even if they just continue the game as it stands as basically being Mordor-Batman, I would be fine too. It was a ton of fun the first time around, and a refined Shadow of Mordor 2 with some more features and more polish would be a damn finde game imho.
On a side note, I was a tiny bit dissapointed they did not capitalize on Shelob's Brood being in Mordor. Give me giant spiders to ride and hunt, dangit!