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As far I know you can not use freenect_launch with kinect2! As you mention kinect2_bridge is working for you. If you want to use image_view you should use the right topic name. I think it should be /kinect2/hd/image_color or similar. The best way is to check which topics are offered after starting kinect2_bridg:

rostopic list

then you can use rviz to shows the intersecting topics. By the way: I can not use image_view to show the depth images from the new Kinect, but is working with the old Kinect. Rviz can show all topics of both Kinects.