I know for sure there are at least two types of forest- evergreen and regular. They don't give different bonuses or anything, but they do look different.
There are some new terrains, a few- Flood Plains (massive food and slight commerce bonus; these look like deserts near rivers, except the parts of the tile that touch the river look lush with green life) and the different sea types.
hmm, probably more, but I don't have all day to spend chatting here- must go play!