I guess you interpreted the comet image much as I did. I wasn't "surprised" by its appearance at all - it looked just as I might have expected a comet to look, except I didn't actually write this beforehand so it doesn't count.

To me, the comet is a spherical version of the Martian polar "Swiss Cheese" terrain, with those circular degassing pits interacting with some sort of layering in the comet to give flattish floors. It isn't as spectacular as swiss cheese, but it's in the same ballpark.

We have a lot to learn about degassing and thawing of volatile icy terrains, and in this regard comets are an importyant part of the story, as is Mars. So too will we learn from Huygens, and from future pluto probes, as well as revisiting Triton to see those Nitrogen geysers in closer detail and compare with the CO2 geysers on Mars.

It's a wierd universe out there, byut ruled by simple physical principles of phase change, energy gradients, and chemical reactions. In principle it is all predictable, but in practice it's too big and complicated, so we have top keep looking and learning.