Cartoonnetwork UK has released a website dedicated entirely to the Ben 10 reboot, with a lot of new information revealed. You can access the website
here. You can play games, read bios and watch videos regarding the aliens. You can even get stickers!
Some interesting new information we got is that Billy Billions, a villain from Omniverse, and Hex are returning. And it appears that Yuri Lowenthal is going to voice Overflow, with Greg Cipes voicing Stinkfly.
Billy Billion's eyes and face has been rounded and he has a pink blush effect on his face. His hair is shinier and they removed his fringe. His tie tie and sleeves has been altered as well.
Hex new design has stayed faithful to the original with some minor differences. He now has altered tattoos and his face is slightly different/ His lower pants are slightly different and he now wears the Charms of Bezel on his necklace. He also wears a red belt.
Also, it seems like Ben 10 is going to unlock quick switch pretty early. The picture below depicts Overflow morhphing into Cannonbolt.