What in the world are you talking about? Titan 2 is going to co-exist with Titan 1 as the higher end of the two devices. HTC said it themselves when people asked why they are releasing a new Titan when the first one has barely been out for a few months. Saying it is going to get Tango and be slower updated...
And no the Titan 2 is not a plastic phone. It follows the same design pattern as all their other phones. Metal unibody. Plastic on top around camera for the camera and wifi. Plastic on bottom for cell radios. The first Titan is not 100% metal either. The phone would not work otherwise with all the signal blockage. It's almost like you've never seen an HTC phone before. Most are metal build with rubber coating.