Winners of the Steam Summer Sale Game Giveaways...

I wasn't one of the winners but I'm sure it was added to their library.

i'd love to know too, also did you receive them immediatly or after a while?
what about pre-orders? and games not yet released for pre-orders?(like gta V)

To the inventory.

Prizes: Each winner will receive the top three (3) single game titles ranked in his or her Steam Wishlist, which are currently available for purchase at the time prizes are awarded. Prize value depends on games in Wishlist; Steam pricing during the sweepstakes period will determine game value. Prizes are not assignable or transferable . Odds of winning depend on the number of eligible entries received and the number of members on the daily winning team. The winners are solely responsible for any taxes applicable to the prizes.

Prizes are not assignable or transferable
meaning that they are added directly to library or are added to inventory without the ability to trade them...that's what I think at least