Barnes & Noble (BKS) warns it expects FY13 (ends in April) Nook Media revenue to be below prior guidance of $3B. Also, the division's EBITDA loss is now expected to be above FY12 levels - prior guidance was for a comparable loss. Last month, BKS reported a 12.6% Y/Y drop in Nook division sales for the holiday season, and IDC estimated the company's Q4 tablet share fell nearly 60% Y/Y to a mere 1.9%. Shares -4.2% AH. FQ3 results are due on Feb. 28.