UPDATE 2-Record low current account surplus shows Japan's challenges

* 2012 current account surplus 4.7 trln yen, record low * Energy imports, weaker yen weighing on balance of payments * Current account surplus likely to continue to shrink * Japan Inc also losing out to competitive overseas rivals By Stanley White TOKYO, Feb 8 (Reuters) - Japan posted its smallest annual current account surplus on record in 2012 as exports weakened and energy imports grew, a signal to Prime Minister Shinzo Abe that economic revival needs more than just a we