Sunglasses, sun lotion, windproof/waterproof shells (top and bottom), gloves, warm hat, sun hat. I am a huge fan of softshell pants now; if no rain in forecast, may be able to use those instead of carrying waterproof shell bottoms. Me, I'd tuck a down sweater or heavy fleece in my daypack, along with a rain shell top, for rest stops or emergency overnights.... Some folks are talking miscrospikes already....
Can't rely on cell reception at all, but the folks last year who got stranded at the summit in October were able to summon help (a helicopter rescue no less) by texting on their phones. Texting may be more of an option than voice service...depending on your phone service and other factors.
