Holeshot device.
Ducati started using this system, based on off-road racing bikes, to help them get off the mark faster. They were quickly joined by Aprilia. Apparently this device lowers the suspension of the bike during the start of the race to help prevent wheelies. It has been confirmed that Yamaha now also boasts such a device. According to the rules such a device is legal, if mechanical. Electronic devices are not allowed.
A very interesting rumour coming from the Sepang testing is that one of two riders are saying they followed Dovi for some laps and they are sure his Ducati dropped its rear suspension during the lap as well, notably on exciting the last corner onto the main straight. If true, they have managed to find some sort of mechanical device that enable them to drop the rear suspension and release it to normal position, while riding. It would be interesting to see where this is going.