There will most definately be two forests. That one old pic we seen of the world map with the good number of location icons on it show both a normal forest and a foggy forest.
I'm not thrilled for reused areas as long as they spice them up. For instance, you could have one forest area where the base idea could be overground exploration. The road woudl be a straight line, but there could be tree exploration. The other forest could have underground exploration, where the ground isn't AS leveled, and there are caves underneath trees, leading to other areas of the forest.