According a tipster via Android Central and Sprint’s internal system, we could be seeing an update coming for the Epic 4G and Zio with OTAs rolling out February 21st. While noone has been able to back it up with “official” proof from Sprint themselves, this rumor has been passed around for a little while now. We all know how rumors work, but seeing the same rumor get passed around intermittently and more and more frequent seems to make it much more likely a fact. Regardless we won’t know for sure until “Old Yeller” opens they’re virtual mouth.

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

[We must also remember these are Samsung devices... I'm sure you get my point without me having to further explain anything]

Source: Android Central