Update: Bones has been renewed for two seasons.
This is a bit anticlimactic since after Thursday's season finale FOX ran voice over saying something like, "Bones will be back with new episodes in the fall". That was definitely official enough for me, but for those needing more, it's officially official, officially. James Hibberd reports:
After protracted haggling over the show's license fee, Fox has picked up veteran dramedy "Bones" for a fifth season.