Well it looks like the people over at the XDA forums have managed to get their hands on a Froyo (2.2) build for the Samsung Epic 4G. The post describes it as a little buggy with issues such as slow browsing, audio skipping and screen brightness issues so if you are really desperate you can check it out here but proceed with caution as this seems like an early build.
My advice is wait until there is something a little more rock solid but I’m conservative that way so if you aren’t than flash away and live on the edge.