Not sure if this will be implemented, but it would be seriously wicked if the elevations went higher than 1 unit.
Seems like you guys are going to do that, based on what the Push Back action seems to be implying.
Just have a look at the upcoming game ‘WarTile’ to see what I mean.
I admit, I haven’t been in the other biomes (other than grasslands and forests) yet, so maybe higher elevations are already present.
That all said, maybe it would be cool to have even grasslands/forests have overall slopes (larger hills/contours made from several hexes), rather than just individual hex ‘plateaus’. (You know those novelty things where it’s a grid of ‘pins’, and you stick your hand/face in it, and all the pins contour to form your hand/face?… Think of that, except with the hexes… A smooth fractal pattern drives the height of the hexes, rather than (what seems to be) just random hexes being ‘1 higher’.)