The Sprint Samsung Epic 4G and the Sanyo Zio are now finally getting the Froyo update. It's been a long wait, but according to Sprint's documents, the Froyo update should take place on February 21, which is tomorrow.

Below is the following Sprint Document:

Software Updates: Samsung Epic (EB13, Froyo) & Sanyo Zio (2.200SP, Froyo)
Effective 2/21/11, software updates will be available for both devices
Over-the-Air (OTA). Both updates will be pushed over a period of days, so
customers will receive them based on their status on the Google servers.
Details:

Samsung Epic
Update will be pushed over a 4-day period
After the update completes, verify the new software version (Menu > Settings
> About Phone)
Baseband Version = S: D700.0.5S.EB13
Build Number = FROYO.EB13

Enhancements/fixes: upgrade to Froyo 2.2, improved bluetooth device support,
bluetooth voice dialing, Flash Player 10.1, GPS enhancements, improved OS
performance, ability to install applications to external storage
Sanyo Zio
Updates will be pushed over a 5-day period
Customers are required to download (accept) three portions of the update to
receive Froyo 2.2
Customers should use WiFi if possible to complete the update
After the updates complete, verify the new software version (Menu > Settings
> About Phone)
Baseband Version = S.M910.04.5.DF05
Build Number = Samsung ÉCLAIR.DF05
Enhancements/fixes: upgrade to Froyo 2.2, addition of Swype, Sprint Zone
2.5.5, Sprint ID activation improvements, better battery life



via: Froyo for the Epic 4G and Sanyo Zio to come Feb 21, says internal Sprint doc | Android Central