Just had this emailed from HTC .....
Thank you for your email. We understand that now that a phone running Android OS 2.1 is available that you are excited to get an update for your Hero. We are still hard at work building Sense for this new version but we expect to have the upgrade finished and ready to go soon. Please understand that it takes time to customize any Android version to ensure you have the intuitive experience Sense provides, and we hope you can be patient for just a little while longer.
Kind Regards,
Anthony M
HTC
... i just hope soon really does mean soon