Sprint seems poised to relase to release Android 2.1 for the HTC Hero. They just released the 2.1 update for the Samsung Moment last week and there is already a leaked version of Android 2.1 for the Hero. http://www.4shared.com/file/gfPzbRcS/RUU_Hero_C_Sprint_2276515_R_si.html
This is not an offical relase, so you take full responsibility if you apply this update. Also, please remember to make a backup of your phone before applying this update it will wipe your phone when you apply this update.