An LCI (facelift) version will not hit roads until late 2014 if they follow the usual BMW life cycle.
As for sales, the F20 is a big hit with Company Car drivers in the UK and this will keep sales strong. The A3 has always been a competitor and will continue to be, but I can't see its new version grabbing market share. The new A class will appeal to many (not my cup of tea at all) but this is a growing segment so again, BMW sales volumes should not be affected too badly. That's my opinion anyway.
2013 BMW F30 320d efficientdynamics Sports Auto - Alpine White, Dakota Black Leather
2011 BMW E92 320d M Sport Auto - Alpine White, Saddle Brown Leather