I receive this today in my mailbox:
Thank you for contacting HTC. Well, we are working on an Éclair update for the HTC Hero. Because Éclair is a significantly enhanced release, it will require some time to update Sense for this new version of the Android OS. Please be patient while we work to provide you with a tightly integrated experience like the one you are already enjoying on Tattoo. However, we haven't received yet any information that the Tattoo will be upgraded to Andriod 2.0. Kindly check on our official website for latest updates and new releases. If you have any other inquiries, don’t hesitate to contact us again.
Please note that my question was regardless Tattoo.