Just got back. We had 7318 (MK view, third floor, studio) for July 4, and then after a cruise had 8404 (LV, 1 BR, north tower outer) for a week.
We booked the MK July 4 view right at the 11 month point, and were disappointed to have been put on the third floor in 7318. We told them we were willing to wait it out for a better room, but they wouldn't budge and said every MK room was booked and that people who want MK for July 4 usually show up earlier and try to move up before the 4th. We also asked for a north tower outer LV studio on a higher floor, but they had nothing. In the end, it wasn't too bad. It's mostly a gorified parking lot view, but you can see the castle and we had a direct view of the July 4 fireworks. Whatchagonna do? It's hard to justify paying so many more points for that room than the standard view below it. But I suppose that's the way it goes.
8404 was a very nice room, with a panoramic view of the lake facing north. Post 1112 is the same room a few floors down, and it's basically the same view. You need to crane to the left to see the castle, but for LV points, it made up for the not so desirable room on July 4.
FWIW, the July 4 fireworks aren't just above the castle -- there are also some above the lagoon. So, if you are hopeful to see the full fireworks show from your room some time on July 3 or 4, even the best LV rooms in the north tower might not be good enough to see all the fireworks. If we had it to do over again, we probably would have just hopped the monorail and watched from the Poly beach, which would have been a fantastic viewing spot.