As of December 2013 the situation stabilized and the site layout was reverted to the old one we all know by heart.
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At first I got worried that the website got hacked. The reality was more shocking:
MobyGames got a face lifting. That was hinted years ago...
Some people moaned about the need of a complete redesign, while I'd be happy with only the most needed fixes and updates.
So far the changes I see are regarding layout/visuals. I don't see suggested fixes/features implemented. Some previous features are removed?buggy? I'd say the whole thing looks untested (supposedly the feedback they got on the back-end approvers-only forum was ignored?) and not ready for public launch. For example you could have separate "have lists", now they're gone/merged?
And the whole front-end fits the trend "we're designing all websites for tablets now"