If the fireworks will in fact be every night then you have better chances to book, during SWW, when it was only on the weekends, most dates sold out in a matter of days so as long as you check the blog and this thread every day you should be fine to book
They do both F! and fireworks. When there are two F! is better to watch the fireworks and then go to the second F!. If you must watch the first then try and sit toward the top of the theater and toward the right and exit as fast as you can.
Not sure how it would work with one F! , I would think it would be fireworks then F!, remember that even the January haven't been set in stone yet, so as soon as the holiday hours update we should get the actual January calendar.