Should be available by the Spring 07 but no prices yet announced.
Looking at past Xda phones on a contract basis one might assume this phone would be in the £200-400 range (subject to your monthly tariff) or perhaps around £500 without contract if available in that form.
I'd expect that it would be compatible with most external rechargeable GPS units (circa £40) if you're looking for the whole enchilada

It would be good to know what other members think with regards to your
earlier question over mobile phone safety in relation to the Stewart Report, i.e. could mobile phones officially be deployed in schools as learning tools?