There's a rumour of the HTC Vision here. This does seem to have a European base (a few recent HTC phones, eg the EVO are limited to US networks)
It must be said though that the Android keyboard if a lot better than the WM one particularly if you get a phone with a capacitive screen. I don't know if you've tried Zoomboard on WM but the Android keyboard is equally easy to use.
Interesting: Still big though, I'd like something xperia mini pro size (hard to please I know). I'll give zoomboard a try.