A new beta version of the Vuforia 4.0 SDK is now available for download. This update includes support for 64-bit apps on iOS and is compatible with Unity 4.6.1 patch p5 or newer. This beta release will help you get started developing and testing 64-bit apps on iOS.
We expect to deploy the commercial Vuforia 4.0 release at the end of February.
Thanks for your support and please let us know if you need additional assistance by posting to this forum. Review the iOS 64 bit Migration article to learn how to adapt your existing Vuforia iOS apps to support 64 bit.