I too would like to see stock terrain tiles that would cover jungle, snow, desert, etc. that could be used (at the same time) in a MA terrain. New factories, additional field layouts, rivers with bridges, and some weather would be interesting to play with also. But if we where getting things like that, the Developer News did not show it. The sample screen shot they put up looks good; but other than showing new terrain tiles and transitions, I don't know what else the image is showing. I'm sure they are not just demonstrating their ability to make the terrain look like it does around the San Diego Wild Animal Park. It would be nice to get some more details.
Edit: Okay, after looking at the screen shot some more, these is one more thing I think I can see. There are no sharp breaks in the terrain. There is a depression near the center of the image that would have made sharp edges if done under our current system. The hills also look more rounded. They should have put a field in there so we could get an idea of the scale or made half the image with the grid turned on. It does make for a more natural looking terrain.