Sometimes they announce the increase a day or so before it goes into effect, sometimes the official announcement doesn't happen until the very last minute. My guess is that if the price increase does happen, we'll start to hear very solid unofficial rumors a few days before they go into effect (usually from authorized ticket sellers). At this point, we've heard some rumblings, but nothing concrete enough to say for sure that it will happen, when it will happen, and what the increase(s) will be.