I hope so. WotLK was fairly lacking in the "troll raids" department. The troll instances we did get were pretty meh; both of them strange underground places.
There's still the closed troll raid instance in Eversong Woods to possibly be added at some point. It wouldn't be the first instance entrance that doesn't end up being a raid, of course; just look at Uldum and Darkwhisper Gorge.