It looks like Sammy has been working hard to bring Gingerbread to all of the Galaxy S devices, as an official build for the Epic 4G leaked over at SamFirmware this morning. Much like the recent Captivate Gingerbread leak, this is an early build, but judging by current reports, it seems to be pretty solid.
Just like this leak, you must flash this via Odin. Here's a quick example of the process:
If you're ready to give it a shot, head over to XDA for download.