A few days ago, Audi announced an addition to its alpha-numerical line-up of the “A” family of sleek cars. This new prototype is known as the Audi A2 Concept, as we were told. According the automaker, the new concept vehicle is set to debut at the next Frankfurt Motor Show in a few weeks time.  Considering the rapid rate with which the company is churning out the models of this line of cars, we reckon it won’t be long before we get to A10 that will complete the cycle. But we’re not yet there – all we have at the moment is the newest member of the family, which is the 2011 Audi A2 Concept