They have a "when it's ready" policy. It is public knowledge there is a firmware (referred to as PR1.1) which will be released sooner rather than later (apparently the biggest hinted changes are Ovi store support and more extensive portrait mode for some applications). There will almost certainly have to be another firmware update around March-April next year which will provide the official Qt4.6 support (announced in October).

As for Maemo 6, that is one mighty big corner if it takes at least a year to get there.