Epic 4G Froyo leak

Contrary to what you might be reading elsewhere, the DK28 Froyo firmware for the Sprint Epic 4G is not the official Froyo build.  According to Sprint's Epic Product Manager:

...this is not approved software for Sprint production devices and we strongly recommend that users refrain from loading it.

While we're sure this is news nobody wanted to hear, but it could be important in the future when the official update does roll out.  Ask an Evo 4G user or two about that. [Sprint support forums]