We're going to be transferring servers soon. I'm pretty confident that we've got the process down, and so it should be relatively seamless. There will probably be anywhere from a few hours (best case) to up to a day of downtime as domains transfer and data is imported/exported.
In addition, we're going to be upgrading to Vanilla 2. We've been on a forked, dead-end branch of Vanilla for a while, and it's going to be easier to maintain if we're up with the latest fixes and plugins, as well as handle some long-running problems with spammers.
This will mean some small changes here and there, and one major change: inline whispers, the main reason we forked, will disappear. You can still of course, private message people to your heart's content, but they won't be displayed in the context of a given thread. All existing whispers will be preserved as private messages.
There is a plugin in the upcoming beta which will re-enable whispers: so as soon as that comes out, we'll play around with it and hopefully put it back into the featureset.
As far as capacity goes, I've done some light-weight load testing, and I think we're in good shape, but we have the room to expand, and will expand as necessary to make the site run smooth.
When is this going to happen? Soon. As early as this weekend, but probably early next week. I'll give some notice when we expect the process to start.
We appreciate your patience, and when we come back up, letting me know about any weirdness/things which are missing would be appreciated.