I've been working working on Katana on and off all along. Part of what has been slowing it down is that the Qt framework was under a lot of churn for a while - things that had worked suddenly didn't, creating the need for nasty workarounds, etc. Now that Qt 4.6 has stabilized and is getting ready to ship with PR 1.2, I've had more chance to focus on real development.

I'm working on the last potentially contentious UI piece. Once that's done (hopefully in the next couple of days), I'll release another alpha to get feedback. I've been using Katana extensively myself, so I've had a chance to fix a lot of the edge cases and weird bugs.

After the next alpha, the only major piece of functionality left is downloading texts over the internet.