Well, the MK.com mods said the forum is going to be available this weekend (until 27th) to allow us to save any info we wanted, however at 12:00 Noon (UK time) on 26th the site seems to be "unavailable or too busy", so perhaps they are starting the updates (or possibly the bandwidth is being taken up by members saving old posts).
edit:12:46 I spoke too soon, it seems to be back up, but access is a bit hit & miss (probably busy).