You’ll just have to settle for 2.0! I can’t say when, but it is coming. If the customer service email from an Android Guys tipster isn’t enough for you (first quote below), then check out the tweet from @htc that follows:
Dear HTC customer,
Thank you for contacting our Customer Support Center. We are dedicated to providing you with the best quality service and answering all of your questions and concerns.
The Hero will not be receiving the Android 1.6 upgrade, it will however get the 2.0 one. Do note however that we do not have a confirmed release date for this upgrade, all I can recommend at the moment is that you keep yourself updated by visiting our website regularly as the latest information will be available to view from there.
HTC customer support team
HTC Corp. Global Service Division
The rumors are true! Hero will be getting an Eclair update. We ask for your patience as we update Sense for the fancy new Android OS.
Via Android and Me