We are working on this at the moment. We have to do a major re-write of the code base in order to bring it up-to-date with the latest WordPress theme requirements. Some of the rewrites won’t even have immediate impact to the theme’s users, but have to be done nonetheless, which partly contributes to the lack of updates.
On top of that, there’s a substantial chance that the kind of changes we need to do will break some sites, particularly those that are heavily customised using child themes. We’re planning to stagger the release of changes so users will have some time to catch up and fix what breaks in-between updates.
I wish we could bring the update sooner, but as you can imagine, it’s a lot more complicated than that. We’ll write more on this when we hit the first re-development milestone.