I'd like to have an easy way of being able to add a dashboard portal of the fixes for the next unreleased version.

There would be a number of ways of doing this. One which seems like a half decent approach would be to make it easy (maybe it already is) to create a filter based on the next unreleased version (that automatically updates when a version is released).

Another would be for there to be a specialised portlet/feature of an existing portlet.