Hi!
The demo server is back, on an Ubuntu Precise now.
MediaWiki: 1.21alpha (0752ba7) PHP: 5.3.10-1ubuntu3.4+wmf1 (apache2handler) MySQL: 5.5.28-0ubuntu0.12.04.3
As before, there are 3 instances: http://wikidata-test-repo.wikimedia.de http://wikidata-test-client.wikimedia.de http://wikidata-test-client-he.wikimedia.de
Best, Silke