--News Corp.'s board approves splitting entertainment, publishing businesses
--New publishing company to buy back $500 million in stock, post split
--News Corp. to take up to $1.4 billion impairment charge in June quarter
(Adds news of News Corp.'s impairment charge in the third paragraph.)
By Ben Fox Rubin, Saabira Chaudhuri and Melodie Warner
News Corp.'s (NWS, NWSA, NWS.AU) board approved the company's separation into two publicly...