Re: memnarch's last commentary (and I'm pretty sure this isn't a spoiler, it's something that would be clear if you'd looked at the video footage so far): Kylo Ren's saber looks different from all other ones we've seen, not just because of the crossguards, but also because the blade is not a smooth, steady shaft of light, but rather it crackles a little bit, as if it was made of fire or lighting (well, just a little bit, it's mostly an ordinary lightsaber).