If they stress for it not to be used in a working environment, they shouldn't have made it public on their official support forums. I understand they did this in order to receive feedback from a live environment, but first impressions are everything in this business. For one, they completely abandoned their core branding with this new design. It looks like a cross between IPB and SMF, and judging by the reactions so far, it's simply not working out with users. vBulletin distinguished itself by introducing a unique postbit and navigation bar. Both have been killed off in this new revision.
However, let's remember, design's not everything. Judging by the feature set, people still seem real underwhelmed with what they're getting - especially at the new increased licensing agreements.