Didn't feel like reading entire thread:
If I recall correctly, someone at Mojang, Jeb, I think, approved an idea on getsatisfaction that was something lie this:
A block that changed color based on light-level. I.e: breaking into a natural cave, placing a torch, and being met with a beautiful sight. That is my theory on what crystal blocks REALLY are, but I haven't found any yet...
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Visit Cobracompany.webs.com for details and contact information.
And of course: Always carry a lighter for those pesky, persistent griefers...
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Dirt... Meaning grass... Changed with the biome. The dirt itself looks like obsidian without the purple.
As for the minecart thing... Would that even make sense? How would you show a powered one? A storage? How would the player sit in it???
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Edit: squids look the same with the pack as without. Remember that the mobs haven't been updated yet.