The problem is, it can go either way: prices might go up or down. Personally, if you are flexible about airlines, dates and airports, I'd be inclined to wait. If you aren't flexible about airlines, dates and airports (eg. you must fly on date a and return on date b and fly from airport x to and from airport y and there's only one or two airlines that serve that route) I'd buy the ticket now to avoid a possible nasty surprise later.