If one looks at Linux on the desktop we see that it is clearly possible to maintain some backward compatibility. As in Ubuntu being Gnome Metacity based with an option for Compiz 3D if the hardware, GPU, supports it. It's very feasible as long as they continue to use an ARM CPU which is likely. Nokia may choose the hardware components but the open source community is very much predisposed to backward compatibility. The Linux kernel architecture makes this very achievable. Guess and hope we can while expressing the customer perspective but time will tell.