I'll have to say that the Planet Cutaway feature is very nice, maybe you could blog a picture of Earth with the feature in action? Also, in the edit feature, can you change how large the mantles are, and how many layers?
Mars Climate is fun, what other planets/moons have climate now?
And, as always, can't been any more excited for Roche Limits.
This will be an amazing update, and I simply cannot wait for it