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Some cool stuff in this build, but the first thing I notice is that MDI browsing is completely broken. I really hope that this is something that'll be fixed in the release version; to me MDI's flexibility constitutes about 90% of the reason why I prefer its UI to other browsers.
Can I just say how much I loathe and despise pointlessly non-standard GUIs - with their oddly shaped windows, buttons that are inconsistent with anything else, and more often than not reduced functionality and damaged usability. That’s one of the reasons I took an instant dislike to Chrome, use Foobar 2000 and VLC rather than fancy skinned media players, and usually breathe a sigh of relief when I turn on Opera’s Windows Native skin.
I hate to see Opera breaking its best features and going in that non-standard direction.