Sounds like the move will start tonight.
We do currently have automatic backups every 24 hours. And the old server will be a backup for the new one: everything will get copied and tested before the old server is finally shut down.
I believe he's going to move one domain at a time, so when Jack's blog at thesurvivalpodcast.com goes, the forum will go along with it.
If I get a heads-up in time, I'll put the forum in Maintenance Mode before the move (which means nobody except forum admins will be able to login). I don't have a lot of time this week to help with the move, so we might be in Maintenance Mode for a while.