Here's a little in progress project so far:

Hex proof of concept. Trying out isometric hexes (conveniently the base has a perfect 2:1 aspect ratio in iso!):
Screen Shot 2014-06-21 at 1.16.52 PM.png

Working out the basic coding to get the hexes displaying
Screen Shot 2014-06-21 at 2.06.47 PM.png

Multiple terrains - plus infinite panning, and the UI workfow to allow picking multiple terrains
Screen Shot 2014-06-22 at 9.35.36 PM.png

Roads and rivers. Rivers run down hex edges, roads run through the middle, solves any conflicts nicely!
Screen Shot 2014-06-29 at 1.49.12 AM.png

Proof of concept for placing locations. This might just work!
Screen Shot 2014-06-30 at 12.37.28 AM.png