Personally I reckon this will be sold as the HTC Ace, not Desire HD.
The Ace turned up on an HTC release schedule with no details at all, but the smart money is that this is actually the Evo 4G re-named for the European market.
I think it is very unlikely HTC would give another phone the Desire name, they've not done it before afaik.
So my money is on this being the Evo4G renamed the HTC Ace for Europe.
BUT, while some of the specs are improved, I'm sure I read that the Evo doesn't have an OLED screen... And the Evo has a weird ridged back plate too, it's not flat
As long as I get 2.2. soon, I'm not worried by this new release. It's inevitable that HTC will release something "better" eventually but this is more of an incremental update than a brand new uber-phone.