Over the Air update just popped up on my phone this morning.
UPDATE 1
Ah, its only the first part of two. System information still reporting version 1.5.
UPDATE 2
Blurb from the HTC support site
Update – HTC Hero Firmware Over The Air (FOTA) update
In our commitment to providing you with the best user experience, we are pushing out a new firmware update to your HTC Hero with the ROM version 2.73.405.5. Your phone will receive a notification of this update when it is made available. Simply press OK to accept the update via a data connection such as Wi-Fi or GPRS/3G. After installing the update, you can confirm a successful update by confirming the Build number (From the Home Screen go to MENU> Settings> About Phone> Build number). The new Build number after the update will be 2.73.405.93; 2.73.405.94 (Nordic) & 2.73.405.95 (Greece/ Ireland). Update Information: Firmware over-the-air (FOTA) client update & YouTube player Update. Note：Please back up your data first before upgrading your phone. We recommend using a free Wi-Fi hotspot or an unlimited data plan to apply this update. If not, standard data connection charges may apply. For any questions, please contact us via http://www.htc.com/www/CA_Hotline.aspx