New Handheld PC from DoCoMo

Not a Pocket PC, but closely related - DoCoMo's 3rd generation Sigmarion Handheld PC. On Pocket PC Thoughts there is even a debate about whether it is a Handheld PC, although if that's what DoCoMo is calling it so I am. Great to have a keyboard but it is much bulkier than a Pocket PC, and as it is running Windws CE .net I doubt it will run software available for Pocket PCs. I wonder if it will also be able to run the limited software available for current Handheld PCs? If little 3rd party software is available this is a huge drawback for anyone who is likely to need anything more than skeleton functionality.