I'm at about 51k words in Mercury and nearing the end. I should have the first draft wrapped up in a few days. I expect the final draft to be longer, of course. I tend to add more during revision than I subtract. During first drafts, my mind tends to race through the story faster than I can type, and things just get left out. So I have to go back and connect the dots.
I've also started working on the blurbs for the trilogy. I've got some pretty good ones, I think, for Venus and Mercury. I'll wait until the first draft of Mars is done before I write a blurb for that one. After all, I'm still outlining it, so I don't really know what the story's about yet.
I've been experimenting with a lot of different cover designs, and I think I've finally settled on one. I just have to make a final decision on the typography and a few minor details.
So that's where I'm at. It's gradually coming together.