Not that the GCF (Global Certification Forum) unveiled any further information but it seems confirmed that Korean Pantech is working on a new Xda smarthpne for O2 which will be called the "Xda Venn". According to the available information, the Xda Venn will feature quadband GSM (but most likely also GPRS and EDGE) as well as singleband UMTS/HSDPA at 2100 MHz.
No word yet about the used operating system but since it's a Xda it can be expected that the O2 Xda Venn (code-name unknown) will feature Windows Mobile (the version is unknown as well):

No word yet on which O2 network the Xda Venn will be released as well as it's unknown when the Xda Venn will be launched but normally it doesn't take to long from the GCF listing to the launch.

Cheers ~ Arne