Apparently the system is going offline for 30 minutes at 1pm GMT that's about 45 minutes from now:
24 Mar 2014 - Activation of frozen balances NEW
As announced in the previous news we will perform the balance freeze of BTC, LTC, FTC and TRC on 25 March at ~01:00 GMT, this will lead to a 30 Minute system downtime.
EDIT: my mistake the 25th is tomorrow.