As a regular away match go-er, it must be said that the overall away support so far this season has been great, a step above last season. Granted, we're playing a lot better, but it's been very noticeable how quickly tickets have sold out this season.
I think every away game bar one (QPR) has sold out in advance, some a week or more before the game itself.
With City not being televised, and it being a Saturday 3pm game, it will definitely sell out. It may possibly go to ST holders + 0 credits at a push, but I imagine these would be the very last tickets. I will be extremely surprised if it goes to general sale.