I don't have a strong preference on this, just a slight bias towards the council blog as is.

reasons:
a) it's more official and better integrated in the overall news structure (read: planet, news...), wheras the forums "feel" more like a place for casual small talk.
b) if I'm not missing anything right now (i tried and checked these pages again before i wrote this), you'd have to create a new section "Council news" to get an RSS-feed. Just posting to any existing section (like "maemo.org") wouldn't do.