I'm also considering switching from N900 to Blackberry Passport. Physical keyboard is a strong argument... However, I have some questions and maybe some ex Maemo & present Blackberry Passport user could easily answer:

1. Which is the best way to get data (contacts, calendar) from N900 to Passport?
2. Is it possible (like in Sailfish) to uninstall/remove Android runtime from Blackberry OS.
3. If yes, then what are the consequences? Is the Android runtime tightly integrated and without it several applications (like Skype etc) in Blackberry World would not install and run?

Thank you in anticipation...