There will be no official 3D support is what Ashley said in an interview, but I've seen a 3rd party 3D webopenGL plugin, so I suppose it's possible. Also, if I recall correctly Unity didn't start off as Unity3d in the beginning.
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the addon is nice and I bought it, however it is utterly a pain in the neck because the actual game editor does not support 3d. You have no way of authoring your levels. It all has to be done in code.