@Idariane from Astrium has posted a first impressive image from the successful sunshield deployment test of Gaia yesterday. The test occured last week on thursday. We have no other news, images and even video about this interesting event from ESA, yet!
Update: Arianespace has put out their press release now with more images: http://www.arianespace.com/news-mission-update/2013/1101.asp
Update 2: ESA published a first image at: http://www.rssd.esa.int/index.php?project=GAIA&page=picture_of_the_week&pow=171
Update 3: Finally, a new blog entry has appeared on the Gaia blog of ESA: http://blogs.esa.int/gaia/2013/10/15/with-pyrotechnic-and-24-bangs-the-sunshield-deployment/