Pocket PC Thoughts has shed some light on why HP suddenly has so many hw6900 models. In a nutshell, there will only be two models, one with a camera and one without. The different model numbers will be used to distinguish which countries they will be offered in and by what carriers. There will also be differences in the software available. For example, North America will have Pocket Streets 2006, Europe will have TomTom and Asia will have MapKing for GPS.
Source: Pocket PC Thoughts