It's been quite a while since I posted on this thread. Data and pictures keep coming back, and news stories pop up now and then.
This one (BBC again) is about some data from the lander, Philae. It was programmed to have a "sniff" of the gases around it ten minutes after landing, and it duly did so, even though it was bouncing well above the surface at the time. The results were sent back before Philae shut down, and have now been analysed and published. There's an interesting range of small organic molecules, including ones containing oxygen or nitrogen; some have never been detected on comets before. One of the researchers used the phrase "a frozen primordial soup".
For those less interested in the chemistry, the article also has some nice pictures, one of which looks to have been taken at or very near the surface.