Asus posted a ten second video teasing a new Asus ZenFone. The handset, which will be introduced at CES next month, will feature dual rear cameras. The video shows the two sensors and then shows the tag line, "See what others can't see."So what capabilities will the dual rear cameras bring to the device? Right now, it is unclear although it is possible that it might allow users to change the focus on a processed picture similar to what is possible with a Lytro camera. Asus might also be planning to offer some of the same features that are available with the duo Camera on the HTC One (M8).