Most of my GMG preorder keys arrived around 5 hours after the "official" launch. Sometimes they'll get 'em out for a preload, but I wouldn't count on it.
yeah, I've only ordered from them for games that had preloads and never had any issues there.
idk, theres no preload for it on steam afaik, which makes me wonder how big the download is.
edit: just got it, a little over 2 hours early, only a 4GB download ^_^