No tethering support for Canon 5D2, or for that matter, any Canon cameras newer than the 350D.
Even the inelegant workaround, the Hot Folder Import Script doesn’t work. And even when it does, it is still more clumsy than Lightroom 2 or Lightroom 3’s implementation of Auto Import, requiring an additional script to work.
As much as I want to like using Aperture (hell, it’s almost S$200 cheaper than Lightroom 3), I’m going to have to pass.