Nie wiem czy dobrze to interpretuje ale w marcu na stronie wizards.com pojawiło się Star Wars Roleplaying Game: Saga Edition FAQ
Updated - March, 2007 w którym wydawnictwo odpowiada na pare pytań i o to co znalazłem:
Will my old books still work with Saga Edition?
There's no easy answer to this question, so the best response is "to varying degrees." Some parts of the rules have seen more revamps than others. For example, alien species and equipment would need a minimal amount of adjustment to be compatible with the Saga Edition rules, while prestige classes, feats, and other similar systems would need heavier conversion. Of course, the source material in your old books will not be invalidated, but some of the game mechanics might or might not work with the new edition of the game.
Will there be a conversion document available?
Yes. The developer of Saga Edition will provide a conversion document that should allow players and Gamemasters to convert to the new system with relative ease. You'll be able to get the document for free on this web site, on or near the launch date of the book.
Czyli z tego co tutaj wnioskuje taki dokument (SRD) wydawca mówił że powstanie. Chyba że się mylę