What does the future hold for mobile devices?  Here are some concept videos to make you ponder. iPhone 6 Trailer Concepts 2014 (source: http://www.youtube.com/watch?v=-Xy_Is1lUZo)   iPhone 6 Concept Exclusive: 3D render video (source: http://www.youtube.com/watch?v=afT3jKayqtY)   Samsung Concept Video (source: http://www.youtube.com/watch?v=4rrEhnXjvIo)   iPad Concept Video (source: http://www.youtube.com/watch?v=9s2oYUy_cVY)