According to an article at Computer Business Review - which was basically about T-Mobile's HSDPA launch in the UK - Ron Langton, data marketing manager for T-Mobile (UK) recently confirmed, that the UK carrier will launch a HTC-based and HSDPA-enabled devices later this year.
However, it wasn't confirmed yet that it is the HSDPA-enabled HTC Hermes (aka T-Mobile Germany's T-Mobile MDA Vario II) indeed but since HTC hasn't announced any other HSDPA-enabled devices yet, nor any other ODMs have announced HSDPA-enabled Windows Mobile devices so far (and he said it's an HTC device), it must be the HTC Hermes:
As for HSDPA handsets, Langton said they will be available in "late Q3 or early Q4," and while he declined to go into details as to the handsets, he did mention that an HSDPA version of HTC's Windows Mobile 5.0-based PDA phones, which T-Mobile calls the MDA range, is planned by the Taiwanese ODM.
On the other hand, late Q3 or early Q4 would be pretty late for the Hermes, since it is expected that T-Mobile Germany as well as O2 Germany and Orange UK will launch the device during this summer. But it could also be an indication, that HTC is late with the HSDPA integration.
Nevertheless, now we have it confirmed from T-Mobile UK, that a HSDPA-enabled Windows Mobile device is coming this year to the UK as well.
Cheers ~ Arne