Click here to see the hidden message (It might contain spoilers)
Actually, this is nothing new. There is a crystal in KOTOR II which changes colour depending on your character's light side/dark side orientation. However, I thought that was a very rare crystal, not the norm. I'm guessing that, since they made them themselves, such a link between them and the crystals would be intrinsic.
On another note:
Click here to see the hidden message (It might contain spoilers)
I asked Paul Kemp via twitter if the Umbarans had an incestuous relationship. He confirmed it.
_________________
I am a Star Wars fan. That doesn't mean that I hate or love Jar Jar. That doesn't mean I hate or love Lucas, or agree or disagree 100% with him. That doesn't mean I prefer the PT over the OT, or vice versa. That doesn't mean I hate the EU, or even love all of it. These are not prerequisites. Being a man is not a prerequisite. Being a geek is not a prerequisite. The only prerequisite is that I love something about Star Wars. I am a Star Wars fan.