I have read a couple of things which suggest that O2 don't intend to pick up the Kaiser. Not sure how accurate the source information is though.
Clove suggests that O2 will be releasing the Kaiser....
Clove Website
Cradle + AC Adapter
Compatibility
HTC TyTN II (P4550/Kaiser), O2 Stellar, MDA Vario III, Vodafone v1615
Stellar would be in keeping with the XDA Orbit naming system and all the other names match. Can't find any other info though. Guess it's a call to O2 Select in the morning then!