It's not neutral while they haven't got the new stand up and running, however I sat in there last year for the Gerrard game and I would say it was about 60-40 Villa fans in the area, maybe more. We were next to Fulham fans who were sound, guess they are used to it, but then again they were hammering us!!
I'll probably go in there again, they are on sale to registered people with a booking history from 29th. I do go to the odd other game there too, probs 2 a season as it's not far for me and a nice day out, so it isn't only Villa on my record.