It'll be interesting to see how many season ticket holders renew. I think it might be a fair bit less than the 5200+ from this last season - but we'll get more paying on a match-by-match basis. A couple of factors that spring to mind.
Last season some of the prices were effectively give-away. Nothing wrong with that - we had an increased ground capacity of over 7000, and it made sense to get fans in, even if you didn't charge them very much. The coming season will have more "realistically priced" tickets.
The other factor is last season the fixture list was pretty much set in stone from the outset - apart from the 2 early home matches that were switched because of the water issues. So you knew exactly where you were. I suspect this season the games will be all over the shop, from Thursday to Sunday - so many people will think it makes more sense to just buy tickets for games you know you can attend. Which also makes sense, as it's not very good if too many people buy season tickets but don't turn up for the games (ok if you have lots of spare capacity, but not so good if you're near capacity on some games).