Okay, maybe I should set out a rough timetable.
I intend to keep working on the design for the first couple of weeks of October. After that, I'll switch to preparing our most recent articles for the transition. Then I think we should have an "open beta" period, where we invite everyone to poke, push and pull the new site to find and report flaws. Hopefully that'll be by the end of October. Once that's done, I'll give the green light to Yop (or whoever) to make it go live. It won't be perfect by then but it should have no major bugs. We can - and I'm sure we will - keep tweaking it after launch.