It seems that the Streetdeck due to be launched at Euro Bus Expo is to have a face-lifted Gemini 3 body:
http://www.route-one.net/vehicles/wrightbus-launch-new-integral-decker-euro-bus-expo/
The front/low windscreen look early E300 styling, whilst the upper deck windscreen looks very East Lancs 'Pyoneer/Low Lander'
The glass staircase is a bit better than the original version on the Gemini 3 demo's
http://www.route-one.net/vehicles/wrightbus-launch-new-integral-decker-euro-bus-expo/
The front/low windscreen look early E300 styling, whilst the upper deck windscreen looks very East Lancs 'Pyoneer/Low Lander'
The glass staircase is a bit better than the original version on the Gemini 3 demo's