The announcement of the release date for the game said that the first Bioshock was included on the Blu-ray disk. It didn't mention anything about getting it if you purchased the digital version, but most people assumed that you would, as the game is in the Playstation Store. If it is included, then it should have been added to your downloads list along with the new game.
When i preordered the game i got the theme and a digital copy of the original Bioshock. the game was supposed to be available midnight of the 26th and it is now the afternoon of the 27th and still no download. i called the Sony help line and after being put on hold 4 times i figured out on my own if you go to the game in the psn and hit download that way it willl download it. its just not available in your downloads list like it is supposed to be. when i did that it also downloaded the additional content as well.