Rowan would be annoying because it'll automatically weaken someone. It'll either make Bray Wyatt look like less of a brain-washing force (though i guess that's digging into it a bit too much) or it'll make Ambrose and Reigns look like idiots if/when he turns on them.
Also, he's a completely uninspiring singles wrestler... he clearly needs to be part of the Wyatt stable.
So yeah, Orton isn't on the card, and makes sense storywise... he'll get a nice enough reaction and he's a name, so it's not the worst thing in the world... just a bit bleh. Cesaro would be good, but not a massive surprise... and if they dig into NXT, they can only really go for Samoa Joe I'd say.