Good timing 
I just started a thread a couple of days ago about pushing Augmented Reality in Unreal:
Unreal, lets make some noise for AR support
TL;DR:
Vuforia and metaio both already provide plugins for Unity to build mobile AR apps.
I would love to see plugins for Unreal too. There have been numerous requests for Unreal support but both companies seem to ignore this.
The questions would be:
Could Epic help pushing the development of such plugins? Maybe by contacting Vuforia and metaio and pointing out that there is a huge interest of the community in developing AR apps in Unreal? Maybe Epic could even provide some technical support in developing such plugins…?
I would really like to see Unreal becoming a powerful tool for (mobile) AR development. The community alone might not accomplish that, but if Epic throws its weight into the balance, we might see some progress…
Epic, can you help? 