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The "preview" skin is available on Google Apps.

I activated it on a new domain yesterday: http://i.imgur.com/PoQ2F.png

where is that to be found?

Settings > Themes

thank you :-) (stupid me)

this isn't the new skin. check out the video or log into a regular gmail.

You may need to switch to the Rapid Release track, so you get new features earlier.

That did it. I thought I was being dense since I couldn't find the Theme setting anywhere. Thanks!

My google apps account got the new theme today.

In your domain admin panel, make sure that you opt into the quick release cycle as opposed to the scheduled one. Since they added that option, apps really doesn't lag any more feature-wise