We're aware of this, but we're in the process of migrating our core hosting infrastructure to a new datacenter at the moment (an unfortunate coincidence in timing with the v3 release, due to contractual obligations) so we're holding off on deploying a new virtual machine for the v3 demo until after the migration is completed on Tuesday.
Sorry to anyone who's been inconvenienced by this; rest assured it will be remedied this week.