Samsung said that they would "review the possibility of implementation of such new version to the existing Samsung products." They clarified that in order to determine the Galaxy S line's potential update, they would have to evaluate "the overall effects of such update to Samsung products, the system requirements, the structural limitations, and the level of cooperation from the component suppliers and software licensors."
Although there were earlier rumors about strict system requirements, we now know that Gingerbread will work with previous devices like the Motorola DROID. So the Galaxy S line must be sufficient.
The Samsung Mobile India Twitter account has now confirmed that the Galaxy S line will be receiving a Gingerbread update. There's no mention of a timetable, and we all know how these companies Twitter accounts can be a little over-eager, so we'll take it with a grain of salt. But it's more likely that Samsung's earlier comments were just erring on the side of caution.
source: Pocket-lint via Samsung Hub