I agree there will be a Lego Star Wars in 2016. I don't think it will be the Rebels since the plan Lego sets don't feature them. Scooby Doo, like the simpsons is a one time thing aimed at older collectors. It will never be a major push.
Also, Lego X-men will never happen. Marvel / DC is burying the X-men until they get the rights back from fox so you won't see dedicated X-men sets. Also its a DC year. Lego has a big line of Dawn of Justice sets so I expect that to be the tie in.
I believe you will only see Lego Star Wars based on VII and Lego Dawn of Justice.
If there is a third game, Maybe Lego Minecraft.
I think you're a little off too. First of all, I can't see Lego Dawn of Justice happening, If there will be a movie tie-in lego game that would be Batman 3. WB won't make a lego game for just one movie.
Lego Minecraft is not happening either, after MS buyout of Mojang and Minecraft license.
Lego Star Wars VII is another weird thing, a Lego game just for one movie. I mean Hobbit had 2 movies and was icredibly empty. A lego game just for 1 movie after movie screening sounds a little off. If there's not going to be a Rebels game, they'll make a lego game for VII + spinoff together.
As for Scooby Doo, it's pretty possible. Warner Bros is in charge of Lego Video games and since Scooby is their own franchise, I totally can see a video game for it.
This I don't see at all. First, Lego has no plans for any new pirates sets. No Justice League because its a Marvel year. THAT SAID, Lego Batman from the Lego Movie is getting his own movie so they might do both with Lego Batman being more general Lego that super hero / DC universe. Last, Lego is letting the license for Middle Earth expire so no new sets.
We don't know if there's going to be new Pirates or Toy Story sets buy Lego has very good relations with Disney, I expect them to release tie in sets for both movies. Same goes for Middle Earth, they may let toy license expire but they still have other licenses from Warner Bros. It'd be similar to Lego Indiana Jones 2 video game, which was released after Lego toy license expired. Also licensed Lego games are selling better than other Lego games (Ninjago, Movie, City) so they might just focus on licensed stuff only.
Adentures of Tintin is another contender for Lego sets & video game. Rumor has it Peter Jackson is looking for more merchandise for next movie to increase popularity and Lego license is best for that since he tried to reach them for first movie but failed because it was a little late (Nanoblocks got the "building toy" license and made awesome sets). Too bad Megabloks has Avatar license.