This is a very interesting thread. Wits and bitters are my 2 fav beers. In fact, I have one of each in the pipeline.
This whole orange thing is so up in the air. Dried bitter, dried sweet, fresh and varied types. All claim to add a slight bit of orange flavor. However, if you read they Hoegaarden website the state something quite interesting. Their claim is that the orange additions offer very little in the way of orange flavor. They claim the orange zest adds the bitterness. According to them, its the special coriander (brewing type) that gives their beer the orange flavor and not the oranges.
That being said, I will probably try the adding of boiled orange flesh and zest to see what happens. Most here say the flavor is not very pronounced. Maybe because the orange sweetness from the juice ferments out. I bet all that is left is some citrus oils that add to aroma?
Well, whatever, the fact is Wits have such great balance. Not too hoppy, not too malty or spicy or wheaty. And god help me, they go down like soda pop.