Sense 3 and now Sense 3.5 - upgrade older phones?
I remember when the Sensation came out with Sense 3 (I think..) and it was mentioned that the Desire HD couldn't handle it because it needed a dual-core CPU. This was obviously shullbit from HTC and most knew it as such. Now this new Sense 3.5 has all the same functionality of Sense 3 with a few little extras thrown in and it's on a phone that has practically identical specs to the Desire HD.
Will the Desire HD see any sign of Sense 3.5? I doubt it. Will HTC admit that the Desire HD could run it easily? Hell no. Customers remember how you treat them and if HTC had any real sense (hah!) they'd upgrade phones that are capable of running it for as long as possible. This is what a customer remembers and that is what earns repeat business. They don't go out and buy a newer phone for a few new features when most are tied into 18 month or longer contracts, not unless they're quite well off.