The new 3-door MQB based A3 was released back in March and sales start just about any day now. This September the 5-door Sportback should be announced with sales starting shortly thereafter.
The new MQB A3 sedan launch timeframe has not yet been announced. All that we know for certain is that it will be a Model Year 2014 vehicle launched sometime in 2013. Whether that means an introduction late this year or early next year with sales to start in summer, 2013; or it means an introduction in late 2013 with sales starting in early 2014 is up in the air as of now.