I definitely think there is an argument that the icon could fit either a space theme or a winter world. It's the fact that they've said the pack is something they've never done before that makes me think there might be another interpretation that we're missing.
Aliens have clearly had a presence in the game (whether they are lacking and need to be fleshed out better is another topic of discussion) and TS3 Lunar Lakes was a space world. We've had elements of winter vacations in the past...think back to Sims 1 Vacation, so it wouldn't be a brand new concept either. I do believe a winter vacation world is coming as it was included in the survey, but based on the timing of that survey, I'm not sure it would be coming out this soon.
Definitely excited to find out more! Hopefully sooner than later since they very clearly purposefully leaked this icon!
