It is the anniversary of Lego Star Wars (20 years?) and each of the new sets have a retro figure to commemorate the original minifigs. So they have nothing really to do with what they are packed in. IIRC Leia is in the Slave I that I still need to get.
“Hey, uh, you know, technically they are just air speeders adapted to the cold. Now what you really want is a Tauntaun, which are built for the natural environment. A little known fact, but scientist have no idea what Tauntauns eat because Hoth is a cold wasteland devoid of life, except for Tauntauns and the Wampas who prey on them. Some people might say this is from lazy world building, but I prefer to think the Creator works in mysterious ways.”