Some users on XDA-Developers are reporting that they are able to update the Samsung Galaxy S to Android 2.2 or FroYo through Samsung’s KIES software.
One user has even posted a browser benchmark which shows that the performance has improved but not as fast as Nexus One or Droid X.
Well this might be just a test build which means that the final version which is due in September will be out soon
Source : XDA-Developers
Thx Kalpik !