Best time to buy tickets for Dec '15 trip?

I’m a newbie to Universal. When is the best time to buy tickets for a trip in December? I notice there is a special right now to buy 2 days and get a 3rd day free but you must use the tickets by June. Do they typically run specials like this later in the year?

None of the specials they are running right now are valid thru Dec, and there probably won’t be another gate price increase until late summer. I’d wait a bit…