No word on a timeframe yet, but you'll know as soon as we do -- promise.With the Android 2.2 upgrade, customers can expect improvements to include the following benefits: updates to user interface, improved EAS Support, improved browser performance, including Flash 10x Support, voice dialing over Bluetooth and application storage on external memory.
Update: According to this tweet from the carrier: "HTC EVO will be updated to Android 2.2; Samsung Moment & HTC Hero will not. Future devices launching w/ 2.1 will be also be updated to 2.2."
Google Android 6.0
HTC EVO 4G