The cobra tube is a new revolutionary tube from fly bikes, it allows you to replace a tube without taking the wheel off. This tube should be out until December or so, right now it’s a prototype and been tested by fly team riders. Fly claims that with this tube you wont feel any bumps or empty spots, so the wheel will be perfectly rounded up, the weight will also be similar to a regular tube.
For us the flatlanders I think it’s a good thing, cause you don’t need to open the wheel than tension the chain while you need to center the wheel in the frame and most important thing is you can fill it with high pressure.