A reply to an email sent to HTC:
Dear xxxxxx xxxxxx, Thank you for contacting us. In regards to the 2.1 update, Htc will be providing a free update to ?clair for European HTC Hero variants.? starting in June', anyone owning an HTC Hero will receive an initial preparatory update, shortly followed by the full ?clair update. For the full update, we would recommend using a free wi-fi hotspot or an unlimited data plan, otherwise standard data charges may apply." I trust that this resolves your query, please do not hesitate to contact us again if required. Thank you for contacting HTC. Kind regards, Federico F. HTC
Hope this is of use.