This comes to use courtesy of our colleagues over at Carscoop who themselves benefited from an intrepid reader who was able to gleam this image from Opel's facebook page of an undisguised, production-ready Astra GTC.
The image here differs somewhat from the GTC concept we saw at Paris last year with different taillights and the absence of 21-inch wheels. But we assume the final fitting for the production GTC/OPC version will get those things.
Powering the GTC/OPC will likely be the same 2.0 liter turbo found in the concept. That unit was good for 290 PS (213 kW / 286 bhp) and came coupled to a six-speed manual gearbox and a limited-slip differential.
The proper sporty handling will be provided by a FlexRide suspension with a compound crank rear axle with a Watt's link.