[Youtube Capture](https://itunes.apple.com/us/app/youtube-capture/id576941441?...) for iOS is a pretty remarkable tool for quickly capturing and sharing video as well. I think it's far superior to Vine, especially because it leverages the powerful YT platform while still including FB and Twitter.
I would assume that the same filters from YT in the Browser are coming to the app as well, making it a far more compelling "Instagram for Video".