Probably more a Kadokawa troll than a KyoAni troll, mind you.
Who owns the Haruhi franchise? Kadokawa Shoten.
Where was the misleading announcement made, about Haruhi airing in April? Newtype Magazine.
Who owns Newtype Magazine? Kadokawa Shoten.
KyoAni is a tiny studio, which makes, at best, 2-3 productions (on its own) a year. They don't have the resources to do much more. This means they have to pick and choose their productions carefully. And, in many ways, I think that if Kadokawa allowed them to, another Haruhi series would already have been made, probably as late
as early 2008. But with publisher/author issues plaguing the entire light-novel series, they've probably made life a bit difficult for KyoAni, which has had to fill the genre gap with shows like Lucky Star and the upcoming Haruhi-chan series.
More to the point, where is my Full Metal Panic continuation, KyoAni? Been waiting for that longer than Haruhi.