In the sets we might have all of our beloved main characters, like Woody, Buzz, Jessie, Rex, Bullseye, Slinky Dog, Hamm, the Aliens, Mr. and Mrs. Potato Head, and so on. When the trailer releases, I'll have more thoughts on sets.

More characters: Mr. Pricklepants, Trixie, Buttercup, and a bunch of others.

Too early. Captain Nemo may shut this down...

The movie doesn't even come out until 2019.

More importantly, this is entirely just misleading speculation.

Until such time we actually know if we will receive any more Toy Story sets (and we don't know if we will), this thread is unnecessary.