Considering that improved atmospheric effects were a part of the KS stretch goal (600k $), and knowing that fauna is not to be taken lightly in its implementation, I doubt we’re gonna see fauna any time soon, unfortunately.
Yeah, fauna would be difficult but maybe just a few more plants and trees. An entire planet thick in fauna would be pretty hard to do. Maybe focus should be on an ice planet or planets with super deep, narrow canyons. Oh, and water - lots of water!
Maybe something simple? Like small birds scattering if you land in a woodland area?
Something closer to temporary animations? Yeah, could be an idea… If there is any woodland 
I’d like to see a double crusted one.
Like it’s having a crust in orbit of a small lava planet with holes to fly through and an odd fauna on the inside living off the glow of the smaller planet.
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I’m not entirely certain such a planet could exist, but even if it could, the game cannot generate such a planet. The way the terrain is computed, any one point of the world can only have a single elevation value: this means no overhangs, tunnels, double crusts, etc.
Certainly not naturally, no. Even if the outer crust could form like that, the gravity of the underlying planet would almost certainly pull it down the moment its structural integrity was compromised (and if there are holes in that crust, the outer structure is compromised!).
In order for an outer later like that to stay up, it would need some sort of rotational motion (you know… it would have to be in orbit!), and solid shells undergo what’s known as rigid body rotation: The rotation speed peaks at the “equator”, and is zero at the rotational poles. If the equator is at orbital velocity, that means everything else isn’t. And the poles never can be, since they’re stationary (even if the poles are wobbling, there will be 2 points on the outer crust at all times with zero angular velocity, even though those points change over time).
I think the best anyone could hope for, I think, would be a Halo style ring world in orbit around a planet.
Not that it is in any way practical, but could you start rotation, and then start a “separate” rotation normal to the original? I’ve not put any sort of calculations into it, and it feels like there would still be migrating “poles,” and the rotational forces would still be uneven I imagine.
Nope. All that does is change the axis of rotation. A solid, rigid object can only spin in one direction at a time.
Picture a globe as a wrap-around (Pac-Man style) 2D square map. Rotating the globe moves features from left to right. Everything is connected and solid. This is basically a zoomed in view of the surface, and not a map of the whole surface, so ignore the fact that the poles aren’t stationary in this setup, and that the land moving south in one place should end up moving north somewhere else before returning to the top.
If we kick it at the poles so that we give it a second spin, from North to South, what will happen? The bits if land at the North Pole will slide South. But so will the land immediately to the south of that. And so will the land immediately to the south of THAT. All of this land is still moving to the right, though.
So, we have a velocity to the east, and a second velocity to the south. These combine to give a total velocity to the south-east! All of the land will have this new south-east velocity, because all of the land is connected to all of the other land. None of it can move independently of the rest (if it could, parts of the crust would pass through other parts of it, and the crust wouldn’t be rigid).
So, now everything on our map is moving diagonally down and to the right. Our equator has tilted, to be the line running from the upper left corner to the lower right, and the poles are now at the upper right and lower left corners.
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Or even the frozen cloud planet 
I know the engine wouldn’t be able to handle caves or honeycomb networks, but it would be awesome to fly through a planet like that 
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So my gut instinct was right, then. Guess those years in college weren’t completely wasted 
The engine is not necessarily unable to handle overhangs and caves. It can have trees and rocks in it and it can have asteroids. So maybe you could generate land features procedurally, like you do with asteroids and then place them on the planet’s surface and try to “merge” them. It probably wouldn’t look as good as terrain displacement, but it could be a good temporary solution if they really need to implement caves or similar for some reason.
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I actually wondered that sort of thing myself, regarding tunnels: would it be possible to just have a section of the surface be “nonexistent,” since I assume the planets themselves are hollow? Then you could just generate a tunnel that fits the hole, and go from there.
That being said, I assume the effort is either not worthwhile or resource intensive, or else they’d have done it I think. After all, there is no getting out of your spacecraft and walking around, so overhangs and tunnels may not be all that valuable, and the development effort is better put to use elsewhere.