I don't think that there are any information available. My feeling is, without having Poser 5, that it will be really difficult to make the features of Poser 5 available to other programs. It seems that a lot of key features are rendering related effects (dynamic hair etc) which means the Poser importing software needs to have similar features. And wether that will be possible, who knows.

One day your ship comes in - but you're at the airport.