Just got an email from HTC themselves, and it looks like the Inspire 4G won't be getting ICS, at least not any time soon... This is concerning an OFFICIAL update, not XDA
"Dear ---- My name----,
I would be happy to address your questions concerning ICS for the HTC Inspire/Desire HD. At this time we have not announced any planned update for the North American Desire HD also known as the Inspire 4g. As of right now this phone is not scheduled to receive an ICS update. If we do decide to release this update for this device in North America the announcement will be made on our Facebook page."
"Dear ---- My name----,
I would be happy to address your questions concerning ICS for the HTC Inspire/Desire HD. At this time we have not announced any planned update for the North American Desire HD also known as the Inspire 4g. As of right now this phone is not scheduled to receive an ICS update. If we do decide to release this update for this device in North America the announcement will be made on our Facebook page."