Okay, so I'll be predicting what might happen in the episodes of Steven's birthday week by what I've seen in the commercials.

Sooo, it's Steven's birthday (obviously) and everyone looks like they're having fun, even Peridot. (kind of) Then you see a snippet of a big sparkley yellow diamond thingy in the sky and Peridot looks very excited and happy to see this. Then in another snippet, you see Peridot in her big robot machine she had built earlier in the episode 'Back to the Barn' and she's throwing a truck at the gems! Then Garnet grabs Steven into a helicopter where Pearl is already in and says something like "there's no time to feel horrible." to which pearl agrees and says "you can feel horrible back in the temple."

Okay so that was what I saw in the commercial and here's my prediction: the yellow thing in the sky is probably (or should I say hopfully) a gem from homeworld that is coming to get Peridot. Peridot still seems like she wanted to go back so she turned on the gems which explains why she was seen throwing a truck at them. The reason why I think Garnet and Pearl wear saying 'you could feel horrible later' to Steven was because he feels horrible for getting the gems to trust Peridot in the first place.
Another scene in the commercial that I forgot to mention was all those Ruby looking gems. That was crazy! If you looked closely in that brief scene you would see that their gem placements are all different, but they all look pretty much the same. What could this mean? I have no idea.
What do you think about my prediction? Do you agree? If so, great! If not, write what you predict what might happen. Don't be shy, I'm always very interested in what to you guys have to say. You guys are amazing to me.