Publishing a new SW rpg would be a dicey proposition for
any
company, and even moreso for a company not primarily known for rpgs. Because the people who love Saga
love
Saga. And the people who love D6
love
D6. And the people who love OCR/RCR are all institutionalized.
So, including 'everything in one book' means spending three times the resources on development, art, graphic design… all resulting in a three-times-the-size book for three times the cost. People who already love a prior incarnation of the rpg might not wanna buy that. And beginning rpgers definitely won't. Not to mention, such a book would have three times the errata.
Doing it this way, FFG can test the waters, keep prices low, and, giving us only street-level characters at first, can work the bugs out of the basic system before moving on to the crazy stuff. And if everyone balks and sticks with Saga/D6, FFG's loss of investment will be less painful if the line doesn't fly.
It's good that you have a great time with Saga… why not play some of that while you wait?
Back on topic: I know I saw it officially stated somewhere (though I can't remember where) that there will be published adventures.