As others have noted, the new tiles are short on contrast -- for now. That makes low alt flying an adventure, since the sameness makes it very tough to tell how close you are to the ground, especially out of the corner of your eye when in combat.
But there's another significant gameplay effect that can be very frustrating - the maproom image is exactly the same color as the surrounding green. Since hills are hard to pick out, the only way to see the maproom clearly is to catch the slit's tan color. Without that, its almost invisible in the sea of green.
Suggest shading the color a bit more off background so it is more visible.