By Martin Baccardax Wall Street futures are mixed Thursday as markets digest a surprisingly hawkish Fed statement while bracing for key December quarter earnings from Apple after the close of trading. Updated at 7:40 am EST U.S. equity futures traded mixed Thursday, after erasing earlier losses in overnight trading, as investors parsed a surprisingly hawkish policy stance from the Federal Reserve ahead of a key inflation reading and prep for December quarter earnings from Apple after the close. Fed Chairman Jerome Powell noted in his question and answer session with the media late Wednesday th…