Remember the rolling droid from the new Star Wars trailer? Turns out, that's not CGI you're looking at. It's a real robot! BB-8 is actually real!! Mark Hamill reveals some info in an interview:
I'm sure he loved the new little droid that's a rolling ball. I'm sure he wants it under the tree this Christmas. They never cease to amaze me with what they're able to come up with, you know? I said, "How are you ever gonna top R2-D2, the most adorable droid in movie history?" And then they have this new one. I can't even tell you his name, but you saw it in the trailer. And when they were demonstrating how they did this thing, live on set — because it's not CGI, that's a live prop — I was just amazed. They let me play around with it. I was running it all around at the creature shop up in Pinewood. I'm telling you, it's an absolute delight. And not having thought that I'd ever go back there, to go back into that world, is just – I get the chills. It's just so much fun.

That's right. Not CGI:

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