What you see here is a prototype version of the all-new Opel Astra GTC OPC, or as Vauxhall buyers in Britain will come to know it, the upcoming Astra GTC VXR, and it was spotted doing test rounds at the Nurburgring race track. Having already revealed the mainstream models of the new and rather sporty looking in a VW Scirocco kind of way GTC, the Astra’s engineers turned their focus on the fastest and most powerful version of the series, which will look a lot like the original concept seen at last year’s Paris Motor Show.
Our spies have photographed and filmed the new Opel (Vauxhall in Britain) Astra Convertible on test in Germany. The vehicles caught testing here are early prototype models as the front doors appear to be carried over complete with their frames from the hatchback model. 
Nevertheless, we are offered out first look at the open-top version of the new Astra series, which is planned to go on sale by early 2013. The most important change over the previous Astra TwinTop is the replacement of the more complicated, heavier and costly retractable metal roof with a traditional fabric hood.
With the new sporty looking three-door Astra GTC on its way and the Astra Sedan outlined by its sister models from Buick’s US (2012 Verano) and China (Excelle) divisions, the only body style left to complete the range of Opel’s C-segment model series is the convertible version. Recently, our spies in Germany caught a glimpse of an Astra-based model, which appears to be the cabriolet variant of the series. While we can’t be 100 percent sure, it is clear that this Astra has a boot while the close ups reveal a more raked rear windshield line than you’d normally expect to see on a four-door family sedan. 
To get an idea of what the Astra Convertible might look like, here's our artist’s impression based on the upcoming GTC model. Even though our image of Opel’s VW Golf Cabriolet contender was styled with a soft-top, it has not yet been revealed if the German company will adopt this solution or if it will continue to use the current Astra TwinTop’s retractable metal roof.
