Whether Nokia Meego will be as "open" as Maemo is a debatable issue considering the DRM they are considering on adding (and if you modify the kernel then the DRM stuff won't work supposedly). So it depends on how invasive the DRM is.

Last I read was, the idea was you can run a non-DRMed version that lets you do whatever you want but then you don't have access to DRMed apps.