2. Lego Makes Its Bow
The other major new character introduced in Toy Story Of Terror - though we don't yet know how much impact it will have - is LEGO, the Scandinavian phenomenon, which is set for its own feature length film very soon. Fans have wanted LEGO in the franchise for some time, and apparently this introduction is a nod to Angus McClane the director, who is a major fan. The image above confirms that there will be at least one character made from LEGO - a yellow rabbit - who might be just a supporting character for background purposes if it wasn't for the fact that two separate stills were released teasing LEGO (including the one above,) which smells like importance. Notice the blue box behind Buzz and Jesse...
We know Pixar are fond of hiding clues and Easter Eggs in plain sight, so perhaps LEGO has a major impact on the plot?