We already know there will be a manual option, but the leak claims the Z, like other future Nissan models and the current Titan, will use the Mercedes based 9G Tronic. That would mean no dual-clutch transmission as the 9G Tronic uses torque converter. If this is the case, it will still be a big upgrade over the Jatco 7-speed in the current model.
Speaking of the current model, the leak confirms that the new Z is an upgraded version of the 370Z and the new base model is, effectively, the 370Z Sport. That makes the new Sport model the old 370Z Nismo, and the leak promises a new Nismo is coming although the person says they have no further information.