Just wanted to post a quick update to this topic, Kenu has released a new larger model of their Airframe vent mount called, of course, the Airframe+. It is meant for the big phablets like the Galaxy Note or the newly announced iPhone 6 Plus.
Here is a link to it on Amazon:
Kenu Airframe+ Car Mount for Phablets
With a little luck I'll have both the iPhone 6 Plus and one of these mounts in a couple weeks and will post a short review here.