It's still on it's way, I've ended up adding alternate tiles for terrain edges which has led to me needing to animate extra variations of water tiles etc. I've reworked the trees for auto tiling as well. The end result is you'll have the option for much more organic looking landscapes but still in keeping with the current clean style.
It's a subtle change but it makes a big difference and I'm really happy with the results. I'll do a dev blog post previewing all this when I'm at the stage of polishing up and doing consistency checks. My current plan is to have the update out some time in September.