Can I wirelessly download videos from my iPhone camera roll to my Mac?
It seems that an USB cable is still required. 

The article in Apple Support that shows how to import videos into iPhoto has not been updated recently. Either Apple is still behind in updating these support articles (not likely) or there is nothing to update--in other words, you still need USB. 

The release notes for iPhoto 9.2 list the major updates to the app. It mentions that iCloud support is now included, but nothing specific about importing videos wirelessly. Hope this helps.