A combo of HTC's world class hardware and Windows Mobile 7 operating System sounds good. HTC mondarian is one such device which has yet to be announced officially but we have a couple of clear images of the device via BestBoyz.de.
A list of specifications are not available yet but with the pics available and buzz around we came up with a vague list of specifications:
Large WVGA touchscreen
At least 5 MP Camera with flash probably with HD recording
Above 1 GHz processor
Windows Mobile 7 OS
Not less than 8GB of inbuilt Memory
Some portals are claiming that Mondrian and Spark are one and the same phone, one made for U.S. and the other one for Europe. But as I said earlier, Nothing official now.