This device has been flying under the radar for a while now, but it looks like it will be showing up in UK stores very soon. The XDA Zest, which from the picture appears to be a mid-range device Windows Mobile 6.1 Professional device, features 3G data, WIFI, GPS and 4GB built-in memory (plus microSD expansion). It should be dropping in O2 some time in November.
It will likely feature the Asus Glide UI, which is Asus’s attempt to pretty up Windows Mobile.
See the O2 Coming Soon page for more info.