It's a bit hard to say exactly what the schedule will look like. Right now my goal is to get about one major biome done per day and have some screenshots of it to post, but that's not always easily accomplishable. And for some of the 'easier' biomes that end up mostly being copy-paste scenarios, I may be able to get more than that.
What I do know is that I want to get all (or at least most) of them finished by the end of March. That may not be doable, because after I finish major biomes, I have to add sub-biomes - rivers, ponds, caves, etc. Rivers (and oceans, naturally) will also probably be a headache for me, and once I tackle those I'll probably be doing some additional work on making water more... well... fluid (and interesting to look at and play with).
After that, I'm going to tackle the building system. I have some REALLY cool ideas about that (or I think so, anyway), and I have a notion that some of the stuff I'm planning on adding will be pretty exciting. I don't want to say too much about that yet, though, because I'd rather show it off through video once it's done - it'll be easier to understand and also much more interesting that way. Building will be in before combat, mostly because it will allow testers a lot more stuff to do, although combat should hopefully follow it pretty closely.
ETA:
Here are some highlands. Rocky outcroppings have received a facelift, as you can see - they were way too red and earthy looking before, and not shaded quite the way I wanted them to be.