An anonymous tip sent to AndroidCentral included a small photograph of an Sprint internal memo telling its employees "Let your customers know we are actively working on having the Android 2.1 platform available to our Hero and Moment customers over the coming weeks."
According to the hard to read document, Sprint is working on releasing the Android 2.1 update for the HTC Hero and Samsung Moment soon, within a few weeks hopefully. I can assume this is spurred by the Nexus One being added. To quote from AndroidCentral's decipher of the image:
"Let your customers know we are actively working on having the Android 2.1 platform available to our Hero and Moment customers over the coming weeks.
Look for more information coming in April about Android 2.1 platform for Hero and Moment."
Possibly an OTA update? Maybe. Let's hope that Sprint learned from Verizon's mistake and won't have problem's dishing out the update to it's subscribers.
Other Sources: BoyGeniusReport
Image from AndroidCentral